Hornstein or Chert, Germany
Chert 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.
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Photo credit: © Phil Degginger / Alamy / Afripics
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Keywords: black, chalcedony, chert, color, conchoidal, cryptocrystalline, dioxide, fine-grained, flint, flint-, fracture, germany, gray, hornstein, metamorphic, microcrystalline, mineral, quartz, rock, sedimentary, silica-rich, siliceous, silicon, specimen, structure, texture, variety
