Typical REE patterns for the two types of high-SiO 2 rhyolite (cold–wet–oxidized and hot–dry–reduced; see text for details) and aplites from different tectonic settings. FC glass refers to interstitial glass from the Fish Canyon magma (Bachmann et al., 2005).Most patterns taken from Glazner et al.(2008).Other data …Once the Rhyolite Ridge project is operational, the site will directly employ 284 persons, for a total of nearly $40 million dollars in annual wages (average total compensation of $140,727 per job). Nearly 681 indirect jobs are projected to be supported through purchases of supplies for the project, generating an additional $40.9 million in annual wages.A paved road heading north (left) from Hwy. 374 will take you to the heart of the the town. The ghost town of Rhyolite is on a mixture of federal and private land. It is …Rhyolit là một loại đá magma phun trào có thành phần axit (giàu dioxide silic) (> 69% SiO 2 — xem phân loại TAS).Nó có thể có nhiều kiến trúc từ thủy tinh, ẩn tinh đến ban tinh.Các khoáng vật chính thường bao gồm thạch anh, fenspat và plagiocla kiềm (theo tỉ lệ > 1:2 — xem biểu đồ QAPF), còn các khoáng vật phụ phổ biến như biotit và hornblend.. Đá trong …Feb 5, 2022 · The History Of Rhyolite. The community of rhyolite started growing in 1905 when several mining camps sprang up after a prospecting discovery which ensued an inevitable gold rush. At its short-lived peak, the community of Rhyolite had thousands of homes with one of the most impressive buildings costing over $ 90,000 to build, with three stories. The Rhyolite Ridge Project is on track to provide environmentally sustainable lithium and boron to support the development of domestic supply chains essential to the electrification of transportation and energy transition in the U.S.Today Ioneer Ltd (ASX: INR, NASDAQ: IONR) released new findings showing a 168% increase of …Rhyolite Jasper is a truly remarkable gemstone that offers a unique combination of beauty and powerful metaphysical properties. By incorporating this stone into your life, you can experience its grounding and balancing effects, emotional healing, and creative inspiration. Whether you choose to wear Rhyolite Jasper as jewelry, use it …Rhyolite is a fine-crystalline felsic extrusive rock. Rhyolite is commonly pink and will often have glassy quartz phenocrysts. Because felsic lavas are less mobile, it is less common than granite. Examples of rhyolite include several lava flows in Yellowstone National Park and the altered rhyolite that makes up the Grand Canyon of the Yellowstone.The siliceous rhyolite provides a source of silica that can form crusts of glassy hyalite opal (Opal-AN) on the surface of the rhyolite, and is often brightly fluorescent due to uranium content. This specimen is an excellent example of hyalite opal on rhyolite matrix from the Thomas Range, and consists of a transparent crust of bubbly hyalite on …Nov 16, 2023 · Rainforest Jasper, also known as Rainforest Rhyolite, is a type of volcanic rock that is primarily composed of the mineral quartz, along with other minerals such as feldspar, biotite, and hornblende. It is characterized by its vibrant and varied color patterns, which often resemble a lush, tropical rainforest landscape. Rhyolite. Rhyolite is a felsic (silica-rich) volcanic igneous rock with the same mineral content as granite, only unlike granite, it cools fast from the molten rock near or over the surface of Earth's crust (extrusive type).When these magmas erupt, a rock with two grain sizes typically forms. The larger crystals that form just beneath the surface …August 9, 2020. Founded in 1904, Rhyolite was once a booming late Gold Rush-era mining town on the edge of Death Valley. People flocked there in the promise of finding gold. Within a few short years, Rhyolite was a bustling mini-metropolis, with two electric plants a hospital, hotels, stores a large school for 250 children, and a red light ... New single "The Day My Daddy Died" Out Now! LISTEN! Contact. [email protected] . Phone: 702-281-9115 Rhyolite is a light-colored, fine-grained, or glassy volcanic (extrusive igneous) rock. It is a silica-rich, felsic rock (high in light-colored minerals like quartz and …Salt Mine contender Ryolite takes on Spider in his first international Rocket League 1v1 showmatch!Twitch: https://www.twitch.tv/FeerTwitter: https://twitter...Rhyolite is a light-colored, fine-grained, or glassy volcanic (extrusive igneous) rock. It is a silica-rich, felsic rock (high in light-colored minerals like quartz and …Rhyolite, with its captivating hues of green and brown, holds significant meaning in the realm of crystal energies. Green, symbolizing growth and healing, reflects Rhyolite’s ability to nurture emotional well-being and foster inner balance. Brown, indicating solidity and foundation, symbolizes Rhyolite’s earthy core, giving a sense of rootedness and …This rhyolite-MELTS modelling was done isobarically at the median storage pressure for each sample determined by the rhyolite-MELTS geobarometer (using matrix glass composition), at water-saturated conditions, and at NNO + 1·5, as determined for the three ilmenite-bearing samples by the Fe–Ti oxide oxybarometer (Ghiorso & Evans, 2008).The Rhyolite ghost town lies about 120 miles northwest of Las Vegas in Nye County, Nevada. It sits near the Nevada-California border at 3,819 feet in elevation. Three ridges border it, with Sawtooth Mountain rising to 6,000 feet about 3 miles northwest of the ghost town. To the south is the Amargosa Desert.RyoliteMar 3, 2023 · Rhyolite was on the way to becoming one of the largest and most prosperous towns in America’s southwest. After six months, the two-tent mining camp turned into a town with more than 5,000 people! Rhyolite became the centre of the Bullfrog Mining District (named as such because the ore deposits were coloured like bullfrogs). Rhyolite is an extrusive igneous rock, formed from magma rich in silica that is extruded from a volcanic vent to cool quickly on the surface rather than slowly in the subsurface. It is …The Iceland Deep Drilling Project Well 1 was designed as a 4- to 5-km-deep exploration well with the goal of intercepting supercritical hydrothermal fluids in the Krafla geothermal field, Iceland. The well unexpectedly drilled into a high-silica (76.5 % SiO2) rhyolite melt at approximately 2.1 km. Some of the melt vesiculated while extruding into …Aug 6, 2020 · Rhyolite is an extrusive, igneous rock of aluminosilicate composition that upon rapid cooling forms obsidian. Obsidian is amorphous and contains limited water portions (< 2 mass%); however, secondary hydration turns it either to perlite (H2O ≈ 2–5 mass%) or pitchstone (> 5 mass%). In the current study, kinetics of hydrous rhyolite dehydration were investigated by thermogravimetry up to ... Mushroom Rhyolite is a special combination stone, also known as Rainforest Jasper, that forms from lava flow with high silica content. It is an igneous rock that is similar to basalt, but it is harder when it cools, and the lava flow itself is more viscous. Rhyolite cools and solidifies very quickly when it comes into contact with the surface.Rhyolite is extrusive equivalent of granite magma. It is composed predominantly of quartz, K–feldspar and biotite. It may have any texture from glassy, aphanitic, porphyritic, and by …Rhyolite, Nevada is one of my favorite ghost towns, so much so that when I'm even remotely in the area, I'll stop by to visit and take more pictures for my collection. There is something intangible about the place that lures visitors in from all over the world.Aug 3, 2023 · Bird’s Eye Rhyolite is believed to have profound mental healing properties. It helps dissolve worries and concerns, allowing one to witness the greater reality and truth. Eliminating negative thoughts and self-doubts facilitates clarity of mind and enhances decision-making capabilities. Apr 6, 2024 · Nestled in the desolate Bullfrog Hills 120 miles from Las Vegas, stands the ghost town of Rhyolite. Near the edge of Death Valley, this once-thriving boomtown sprang up in 1905 when gold was discovered nearby; the death of Rhyolite proved to be equally dramatic. By 1907, Rhyolite had electricity, running water, concrete sidewalks, telephones ... RYOLITE INDUSTRIES PVT LTD - Manufacturer of Led Bulb from Pune, Maharashtra, India.Provided to YouTube by CDBabyTired of Traveling · The Rhyolite SoundDesert Honky Tonk℗ 2017 The Rhyolite SoundReleased on: 2017-10-14Auto-generated by YouTube.Composition de la rhyolite. La composition minéralogique de la rhyolite est définie comme contenant majoritairement du quartz et du feldspath avec une teneur totale en silice supérieure à 68 %. Quartz dans la rhyolite peut être aussi faible que 10% mais est généralement présent en quantités de 25% à 30%. Feldspaths comprennent souvent ...Mahaveer Rhyolite is an unmatched Residential property located in Bannerghatta Road, Bangalore. The project offers plenty of benefits that includes prime location, comfortable and lavish lifestyle, great amenities, healthy surroundings and high return. Location Advantages:.The gray rhyolite locally grades into slightly altered white, silicified, pyrite-bearing rhyolite and hornblende-bearing rhyolite. The hornblende-bearing rhyolite contain discrete, green hornblende porphyroblasts (0.5–2 cm), which are considered to be metamorphic in origin (Praveen and Ghosh, 2009).Rhyolite E-bikes - conceived, designed, and developed in Rotorua – We offer E-MTB framesets that are custom built to your requirements – take only the good bits that you really want and dial in your E-Bike experience. Our First Edition model is limited to 100 units and is debuting at Crankworx 2022Mar 21, 2015 · Rhyolite is made up of quartz, plagioclase, and sanidine, with minor amounts of hornblende and biotite. Trapped gases often produce vugs in the rock. These often contain crystals, opal, or glassy material. Many rhyolites form from granitic magma that has partially cooled in the subsurface. When these magmas erupt, a rock with two grain sizes ... Nestled in the desolate Bullfrog Hills 120 miles from Las Vegas, stands the ghost town of Rhyolite. Near the edge of Death Valley, this once-thriving boomtown sprang up in 1905 when gold was discovered nearby; the death of Rhyolite proved to be equally dramatic. By 1907, Rhyolite had electricity, running water, concrete sidewalks, …Composition de la rhyolite. La composition minéralogique de la rhyolite est définie comme contenant majoritairement du quartz et du feldspath avec une teneur totale en silice supérieure à 68 %. Quartz dans la rhyolite peut être aussi faible que 10% mais est généralement présent en quantités de 25% à 30%. Feldspaths comprennent souvent ...Rhyolite is an extrusive, igneous rock of aluminosilicate composition that upon rapid cooling forms obsidian. Obsidian is amorphous and contains limited water …Rhyolite is an extrusive rock that has fine-grained crystals. The crystals can include quartz, feldspar, and mica, making the stone similar to granite. One way that Hickoryite is different from other rhyolite varieties is that it isn’t as hard. Rhyolite is known for having a hardness rating of 6 to 6.5 on the Mohs scale.Rhyolite Resources Ltd. engages in the acquisition, exploration, and development of mineral properties in the United States. The company was incorporated in 2006 and is based in Vancouver, Canada.Although rhyolite is the dominant magma erupted (> 97% of OVC products), small basaltic eruptions were associated with rhyolitic episodes at: (a) Rotomahana sometime between 22–28 ka (Nairn, 2002); and at (b) Tarawera at the beginning of the 21.9 ka Okareka eruption episode (Nairn, 1992).Mar 13, 2023 · Características e Propriedades. As rochas riolíticas têm uma notável semelhança com o granito, devido a serem classificadas como rochas félsicas, exceto que o riolito tem uma textura de grão fino com fenocristais, que são pequenos cristais às vezes embutidos na rocha. Os minerais que compõem a composição desta rocha são mica ... Rhyolite is an extrusive rock that has fine-grained crystals. The crystals can include quartz, feldspar, and mica, making the stone similar to granite. One way that Hickoryite is different from other rhyolite varieties is that it isn’t as hard. Rhyolite is known for having a hardness rating of 6 to 6.5 on the Mohs scale.Rhyolite is an igneous rock because it forms from the cooling of magma. Igneous rocks can be further classified as either extrusive or intrusive. Rhyolite is an extrusive igneous rock because it forms at or near the Earth’s surface. In contrast, sedimentary rocks are rocks that form from the deposition and consolidation of sediment.Rhyolite GigaPans. Rhyolite Thunderbird rhyolite. Rhyolite in Thin Section Thin Section GigaPans. Porphyritic rhyolite, plane polars Porphyritic rhyolite, crossed polars. Porphyritic rhyolite, plane polarsRhyolite RR Depot Las Vegas and Tonopah RR . 1906 Rhyolite, Nevada was founded in 1904 after Shorty Harris and Ed Cross discovered Gold in the Rhyolite Quartz at the Bullfrog mine. By 1906 the town had two railroad lines and a population of 10,000. The mines, however, did not produce as expected and by the early 1910s … Type Igneous Rock Texture Aphanitic (Fine-grained) Origin Extrusive/Volcanic Chemical Composition Felsic Color Light Gray Mineral Composition Potassium Feldspar, Quartz, Sodium Plagioclase, Biotite, Hornblende Miscellaneous Flow banding Tectonic Environment Convergent Boundary – Andean-type subduction zones, intracontinental hot spots and rifts We have studied glass-bearing leucocratic (granitic to Qz-monzonitic) crustal xenoliths from the Tindfjöll Pleistocene volcanic complex, SW Iceland. The xenoliths consist of strongly resorbed relicts of anorthitic plagioclase, K-rich feldspar and rounded quartz in colorless through pale to dark-brown interstitial glass. Spongy clinopyroxene …Rhyolite stones is available in many colors, ranging from gray to pink. While it certainly looks like a common, unassuming rock at first glance, some rhyolites have a delightful surprise within them. Some rhyolite stones are host to gemstones, particularly topaz, fire opal, red beryl, jasper, and agate. Many of these gems can be found embedded in …The Rhyolite Ridge lithium -boron project is located in Esmeralda County, Nevada, approximately 40 miles south-west of Tonopah. It is made up of two lithium-boron deposits namely North Basin and South Basin, which are located 4km apart. The project is located near the western slope of the Silver Peak, which hosts a metamorphic core complex of ...Rhyolite Meanings, Zodiacs, Planets, Elements, Colors, Chakras, and more. Science & Origin of RhyoliteRhyolite is a silica-rich volcanic rock created from violent and explosive eruptions. As magma during an active eruption brews beneath the surface, granite begins to form. During this time, these subsurface, newly formed crystalline structures are …Mahaveer Rhyolite is an unmatched Residential property located in Bannerghatta Road, Bangalore. The project offers plenty of benefits that includes prime location, comfortable and lavish lifestyle, great amenities, healthy surroundings and high return. Location Advantages:. RHYOLITE RIDGE LITHIUM-BORON PROJECT. In a time when clean energy and environmental responsibility are of the highest priority, one project is dedicated to leading the way – the Rhyolite Ridge Lithium-Boron Project. Located in Esmeralda County, Nevada, Rhyolite Ridge holds the largest known lithium and boron deposit in North America. Mar 13, 2023 · Características e Propriedades. As rochas riolíticas têm uma notável semelhança com o granito, devido a serem classificadas como rochas félsicas, exceto que o riolito tem uma textura de grão fino com fenocristais, que são pequenos cristais às vezes embutidos na rocha. Os minerais que compõem a composição desta rocha são mica ... Rhyolite is an extrusive, igneous rock of aluminosilicate composition that upon rapid cooling forms obsidian. Obsidian is amorphous and contains limited water …Rhyolite is a fine-grained igneous extrusive rock of high silica content or felsic rock. Rhyolite is composed principally of quartz and feldspar minerals, and traces of biotite, plagioclase, mica, amphibiotes, and pyroxenes. It resembles granite in mineral composition, although granite is an intrusive igneous rock. Rhyolite is of a glassy texture and its …Rhyolite. Volcanic rock (or lava) that characteristically is light in color, contains 69 or more percent of silica, and is rich in potassium and sodium. Low-silica rhyolite contains 69 to 74 percent silica. High-silica rhyolite contains 75 to 80 percent silica. Rhyolitic lavas are viscous and tend to form thick blocky lava flows or steep-sided ...Rhyolite. Volcanic rock (or lava) that characteristically is light in color, contains 69 or more percent of silica, and is rich in potassium and sodium. Low-silica rhyolite contains 69 to 74 percent silica. High-silica rhyolite contains 75 to 80 percent silica. Rhyolitic lavas are viscous and tend to form thick blocky lava flows or steep-sided ... Rhyolite is a captivating stone that ignites charisma and courage within the individual. Its brilliant hues stimulate the Solar Plexus and Heart Chakras, boosting self-confidence and power. Hold the stone in your hand and visualize yourself radiating with confidence and inner strength. Composition de la rhyolite. La composition minéralogique de la rhyolite est définie comme contenant majoritairement du quartz et du feldspath avec une teneur totale en silice supérieure à 68 %. Quartz dans la rhyolite peut être aussi faible que 10% mais est généralement présent en quantités de 25% à 30%. Feldspaths comprennent souvent ...Situated in Arekere, the Reddy Mahaveer Rhyolite is planned to offer a modern lifestyle to all the residents. This precisely planned Reddy Mahaveer Rhyolite project's prices are available in the range of Rs. 70. 0 Lac - 71. 0 Lac. The property is a part of an integrated township which spreads over an area of 4 Acre.The Mount Jasper Lithic Source is a prehistoric archaeological site in Berlin, New Hampshire. Located on the slopes of Mount Jasper on the north side of the city, it includes one of the only known evidences of mining by pre-Contact Native Americans in the eastern United States. The mountain is a source of rhyolite, apparently prized for its ...Although both basalt and rhyolite form near continental divides, basalt is more commonly found in oceanic basins whereas rhyolite is rarely found there. Basalt is extremely common on the Earth’s subsurface whereas rhyolite forming granitic eruptions rarely occur leading to less formation of the rock. Crystals, opals, and other glassy rocks ...Rhyolite: A collective term for silicic volcanic rocks consisting of phenocrysts of quartz and alkali feldspar, often with minor plagioclase and biotite, in a microcrystalline or …Mahaveer Rhyolite in Arekere, Bangalore is a popular society in the city, it is well made and has all the amenities you need. No matter what the weather is like outside, you can always try out True in this society to beat boredom, There is ample car and bike parking in this society, your vehicle will be fully protected and safe here. The meaning of RHYOLITE is a very acid volcanic rock that is the lava form of granite. Situated in Arekere, the Reddy Mahaveer Rhyolite is planned to offer a modern lifestyle to all the residents. This precisely planned Reddy Mahaveer Rhyolite project's prices are available in the range of Rs. 70. 0 Lac - 71. 0 Lac. The property is a part of an integrated township which spreads over an area of 4 Acre.Rhyolite is a common igneous rock that can be found all around the world. It is made of quartz and feldspar, and often has interesting features like inclusions of larger crystals. …Sep 17, 2020 · Rhyolite grew as long as the gold held out, from 1905 through 1910. In its heyday, Rhyolite had three train lines, three newspapers, three swimming pools, three hospitals, two undertakers, an opera, and symphony and 53 saloons. By 1914, Rhyolite was in decline and by 1919, it was a deserted ghost town. Its last resident died in 1924. Feb 5, 2022 · The History Of Rhyolite. The community of rhyolite started growing in 1905 when several mining camps sprang up after a prospecting discovery which ensued an inevitable gold rush. At its short-lived peak, the community of Rhyolite had thousands of homes with one of the most impressive buildings costing over $ 90,000 to build, with three stories. Étude de la Rhyolite : échantillons, texture, minéraux, formation, microscope.Révisions ECE. ️ Rhyolite au microscope - Site de Frederic Labaune : http://www...RHYOLITE. Volcanic rock (or lava) that characteristically is light in colour, contains 69 or more per cent of silica and is rich in potassium and sodium. Low- silica rhyolite contains 69 to 74 per cent silica. High- silica rhyolite contains 75 to 80 per cent silica. Rhyolitic lavas are viscous and tend to form thick blocky lava flows or steep ...Rhyolite, extrusive igneous rock that is the volcanic equivalent of granite. Most rhyolites are porphyritic, indicating that crystallization began prior to …Rhyolite was born during the Gold Rush and, realistically, fizzled out just as quickly as it had started. The town was founded in 1904 and by 1916, the town was completely devoid of any previous signs of booming life. Since then, Rhyolite has sat, untouched and alone, for decades, and still continues to be a tourist attraction to this day.Rhyolite is a ghost town in Nye County, in the U.S. state of Nevada. It is in the Bullfrog Hills, about 120 miles (190 km) northwest of Las Vegas, near the eastern boundary of Death …We have studied glass-bearing leucocratic (granitic to Qz-monzonitic) crustal xenoliths from the Tindfjöll Pleistocene volcanic complex, SW Iceland. The xenoliths consist of strongly resorbed relicts of anorthitic plagioclase, K-rich feldspar and rounded quartz in colorless through pale to dark-brown interstitial glass. Spongy clinopyroxene … An interesting abandoned ghost town. Nov 2021 • Couples. Rhyolite Nevada is located just off of Highway 374 about 5 miles outside Beatty. Rhyolite is a ghost town in Nye County and is located in the Bullfrog Hills, about 120 miles northwest of Las Vegas, near the eastern boundary of Death Valley National Park.
1.1 Definition. Felsite is a very fine grained volcanic rock that may or may not contain larger crystals and light colored rock that typically requires petrographic examination or chemical analysis for more precise definition. Rhyolite is a fine-grained igneous rock which is rich in silica. 1.2 History. 1.2.1 Origin.. Route finder
Rhyolite-MELTS is identical to the MELTS calibration except that the enthalpies of formation of both quartz and endmember KAlSi3O8 in feldspar solid solution have been adjusted. This was done in order to model invariant behavior in naturally occurring liquids that approximate compositions in the water-saturated quartz-two-feldspar ternary.Jun 15, 2023 · Rhyolite Jasper is a type of volcanic rock formed from the cooling of molten lava. It is primarily composed of quartz, feldspar, and other minerals, which give it its unique appearance and properties. This gemstone can be found in various locations worldwide, including the United States, Mexico, Australia, and Brazil. Rhyolite is a combination stone, which gives it unique patterns of specs and swirls. The synergistic effects of different minerals and their interactions also work to create an even …Rhyolite is a fine-crystalline felsic extrusive rock. Rhyolite is commonly pink and will often have glassy quartz phenocrysts. Because felsic lavas are less mobile, it is less common than granite. Examples of rhyolite include several lava flows in Yellowstone National Park and the altered rhyolite that makes up the Grand Canyon of the Yellowstone. Rhyolite: A silica-rich volcanic rocks consisting of phenocrysts of quartz and alkali feldspar, often with minor plagioclase and biotite, in a microcrystalline or glassy groundmass and having the chemical composition of granite . Photos. Hand Sample Photos (2) Thin Section Photos (2) Phase and Chemical Maps (1) Typical Minerals. quartz. sanidine. Rhyolite: A collective term for silicic volcanic rocks consisting of phenocrysts of quartz and alkali feldspar, often with minor plagioclase and biotite, in a microcrystalline or …Rhyolite was born during the Gold Rush and, realistically, fizzled out just as quickly as it had started. The town was founded in 1904 and by 1916, the town was completely devoid of any previous signs of booming life. Since then, Rhyolite has sat, untouched and alone, for decades, and still continues to be a tourist attraction to this day. Rhyolite: A silica-rich volcanic rocks consisting of phenocrysts of quartz and alkali feldspar, often with minor plagioclase and biotite, in a microcrystalline or glassy groundmass and having the chemical composition of granite . Photos. Hand Sample Photos (2) Thin Section Photos (2) Phase and Chemical Maps (1) Typical Minerals. quartz. sanidine. Oct 24, 2014 · Rhyolite, of course, had its brothels. And it is still a darn good ghost town. Beatty historian Suzy McCoy, the leading expert on Rhyolite history, reports that 21 Hollywood movies have been filmed in the old town, including Cherry 2000 in 1985. Rhyolite Brothels. Mabel Vaughn was the first woman to buy property in Rhyolite. Rhyolite, Nevada is one of my favorite ghost towns, so much so that when I'm even remotely in the area, I'll stop by to visit and take more pictures for my collection. There is something intangible about the place that lures visitors in from all over the world. Rhyolite: A silica-rich volcanic rocks consisting of phenocrysts of quartz and alkali feldspar, often with minor plagioclase and biotite, in a microcrystalline or glassy groundmass and having the chemical composition of granite . Photos. Hand Sample Photos (2) Thin Section Photos (2) Phase and Chemical Maps (1) Typical Minerals. quartz. sanidine. August 9, 2020. Founded in 1904, Rhyolite was once a booming late Gold Rush-era mining town on the edge of Death Valley. People flocked there in the promise of finding gold. Within a few short years, Rhyolite was a bustling mini-metropolis, with two electric plants a hospital, hotels, stores a large school for 250 children, and a red light ...A paved road heading north (left) from Hwy. 374 will take you to the heart of the the town. The ghost town of Rhyolite is on a mixture of federal and private land. It is …Rhyolite definition: a fine-grained igneous rock rich in silica. See examples of RHYOLITE used in a sentence. Rhyolite is an extrusive, aphanitic (fine-grained), light-colored (felsic) igneous rock consisting of between 20-90% quartz, less than 15% dark-colored minerals, and feldspar. Alkali feldspar makes up 35 to 100% of the total feldspar content. Rhyolite may contain some larger crystals know as phenocrysts. While rhyolite is a clearly defined rock ... Define rhyolite. rhyolite synonyms, rhyolite pronunciation, rhyolite translation, English dictionary definition of rhyolite. n. A fine-grained extrusive volcanic rock, similar to granite in composition and usually exhibiting flow lines..