Chert

CHERT
- CHEMICAL -
Group: INORGANIC (one type)	Group: BIOCHEMICAL (another type)
Composition: Microcrystalline Quartz SiO₂	Composition: Microcrystalline Quartz SiO₂
Description: very compact, hard rock made from silica deposited directly from water	Description: very compact, hard rock made of hard parts of microscopic marine organisms


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