Chert (/ tʃ ɜːr t /) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, [1] the mineral form of silicon dioxide (SiO 2). [2] Chert is …

2023年4月23日 · 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 …

Chert 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 …

Chert 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 can …

chert 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, …

Chert is a hard, fine-grained sedimentary rock composed almost entirely of silica (SiO₂) in the form of microcrystalline or cryptocrystalline quartz. Known for its durability, waxy or dull luster, …

Explore the world of chert, a cryptocrystalline quartz rock valued for its historical significance in tool-making and its modern uses in construction, jewelry, and decorative arts. Learn about its …

2019年11月6日 · Chert is the name for a widespread type of sedimentary rock that is made of silica (silicon dioxide or SiO 2). The most familiar silica mineral is quartz in microscopic or …

Chert is a hard and compact sedimentary rock, consisting dominantly of very small quartz crystals. It is a common rock type which occurs mostly in carbonate rocks either in nodular …

Chert is a microcrystalline rock consisting almost exclusively of silica. Chert may occur as stratiform units, with often-spectacular laminar alteration of colors (red, white, black, green), in …