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See all on WikipediaChert is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert is characteristically of biological origin, but may also occur inorganically as a chemical precipitate or a diagenetic replacement, as in petrified wood. … See more
In petrology, the term "chert" refers generally to all chemically precipitated sedimentary rocks composed primarily of microcrystalline, cryptocrystalline and microfibrous silica. Most cherts are nearly pure silica, with … See more
The cryptocrystalline nature of chert, combined with its above average ability to resist weathering, recrystallization and metamorphism has … See more
There are numerous varieties of chert, classified based on their visible, microscopic and physical characteristics. Examples are: See more
• Photo & note re: Fig Tree Formation
• Microphotographs of Fig Tree fossils
• Schopf, J.W. (1999) Cradle of Life: The Discovery of Earth's Earliest Fossils, Princeton University … See more
Chert is of only modest economic importance today as a source of silica (quartz sand being much more important.) However, chert … See more
• Petrology – Branch of geology that studies the formation, composition, distribution and structure of rocks
• Archaeology – Study of human activity … See moreWikipedia text under CC-BY-SA license WEBApr 23, 2023 · Chert is a fine-grained sedimentary rock composed of quartz (SiO2) that is microcrystalline or cryptocrystalline quartz. It is usually organic rock but also occur …
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Mill Creek chert is a type of chert found in Southern Illinois and heavily exploited by members of the Mississippian culture (800 to 1600 CE). Artifacts made from this material are found in archaeological sites throughout the American Midwest and Southeast. It is named for a village and stream near the quarries, Mill Creek, Illinois and Mill Creek, a tributary of the Cache River. The chert was used exten…
Wikipedia · Text under CC-BY-SA license- Estimated Reading Time: 6 mins
WEBChert is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert is …
WEBNov 6, 2019 · Chert is a sedimentary rock composed of silica in microcrystalline or cryptocrystalline form, derived from siliceous ooze …
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WEBChert is a sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO 2). It occurs as nodules, concretionary masses, and as layered deposits. …
WEBChert is a type of rock that includes flint and agate. It sometimes has fossils in it, usually shells. It is a sedimentary rock, and it is very hard. It is made from quartz. People used …
WEBChert and flint, very fine-grained quartz (q.v.), a silica mineral with minor impurities. Several varieties are included under the general term chert: jasper, chalcedony, agate (qq.v.), flint, porcelanite, and novaculite. …
Chert: Identification, Pictures & Info for Rockhounds
WEBChert is a biochemical sedimentary rock made from microcrystalline quartz. It is very hard – registering a 7 on the Mohs hardness scale, and displays conchoidal fracturing. Chert …
WEBCategories: Sedimentary rocks. Quartz varieties. Hidden category: Commons category link is on Wikidata.
Chert - New World Encyclopedia
WEBChert is a fine-grained, silica-rich, microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils.
Chert | Natural Atlas
WEBChert ( ) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert is …
chert - Wiktionary, the free dictionary
WEBJun 25, 2024 · chert (countable and uncountable, plural cherts) (geology, uncountable) Massive, usually dull-colored and opaque, quartzite, hornstone, impure chalcedony, or …
Chert
WEBChert (pronounced /ˈtʃɝt/) is a fine-grained silica-rich cryptocrystalline sedimentary rock that may contain small fossils. It varies greatly in color from white to black, but most often …
Pilbara Craton - Wikipedia
WEBThe Pilbara Craton is one of only two pristine Archaean 3.8–2.7 Ga (billion years ago) crusts identified on the Earth, along with the Kaapvaal Craton in South Africa. The …
Chert's Timeless Appeal: How It Shaped History and Modern Uses
WEBSep 8, 2023 · Chert is a hard, fine-grained sedimentary rock that has been used for centuries as a tool for cutting and shaping other materials. Composed primarily of …
Category:Chert - Wikimedia Commons
WEBCategory:Chert - Wikimedia Commons. From Wikimedia Commons, the free media repository. Deutsch: Mozarkit. ·. Español: Mozarkita. ·. 日本語: チャート. ·. …
Chert Definition & Meaning - Merriam-Webster
WEBThe meaning of CHERT is a rock resembling flint and consisting essentially of a large amount of fibrous chalcedony with smaller amounts of cryptocrystalline quartz and …
Gunflint chert - Wikipedia
WEBThe Gunflint chert (1.88 Ga) is a sequence of banded iron formation rocks that are exposed in the Gunflint Range of northern Minnesota and northwestern Ontario along the north …
Rhynie chert - Simple English Wikipedia, the free encyclopedia
WEBThe Rhynie chert is a Lower Devonian sedimentary rock, part of the Old Red Sandstone. It has extraordinary fossils, and is a Lagerstätte. The chert is exposed near the village of …
Radiolarite - Wikipedia
WEBRadiolarite is a siliceous, comparatively hard, fine-grained, chert -like, and homogeneous sedimentary rock that is composed predominantly of the microscopic remains of …
Chert - Wikipedia
WEBChert este o varietate de cuarț microcristalin găsită în calcar ( silexul este o altă varietate, găsită în cretă ), respectiv un subtip de silicolit. În vorbirea populară se mai numește și …
Rhynie chert - Wikipedia
WEBThe Rhynie chert is a Lower Devonian sedimentary deposit exhibiting extraordinary fossil detail or completeness (a Lagerstätte). It is exposed near the village of Rhynie, …
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