出典:Wiktionary
出典:『Wiktionary』 (2024/06/25 14:18 UTC 版)
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chert (countable and uncountable, plural cherts)
Generally, in mineralogy and geology, a chert does not have a conchoidal fracture. In North American archeology the term chert occasionally is still used for various siliceous minerals (including flint) that have a conchoidal fracture; this leads to confusion between the terms flint and chert in some archeology texts.
出典:Wikipedia
出典:『Wikipedia』 (2011/05/08 02:12 UTC 版)
Chert (
/ˈtʃɜrt/) is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils. It varies greatly in color (from white to black), 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 (in its oxidized and reduced forms respectively).
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