CHERT

Chert

Chert is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils. It varies greatly in color, but most often manifests as gray, brown, grayish brown and light green to rusty red; its color is an expression of trace elements present in the rock, and both red and green are most often related to traces of iron .

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chert

Noun

  1. Massive, usually dull-colored and opaque, quartzite, hornstone, impure chalcedony, or other flint-like mineral.
  2. A flint-like tool made from chert.


The above text is a snippet from Wiktionary: chert
and as such is available under the Creative Commons Attribution/Share-Alike License.

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