Definition
Origin
Discoverer
Etymology
Class
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Other Categories
Chert is a hard, dark, opaque sedimentary rock which is composed of silica with an amorphous fine-grained texture
From flint-like quartz, 1670s, of unknown origin- a local term, which has been taken into geological use
Fine Grained Rock, Opaque Rock
Jaspillite is an iron rich chemically formed rock which is common in banded iron formation rocks
Western Australia, Minnesota
From Jaspilite (Mineral), a compact siliceous rock which resembles jasper
Coarse Grained Rock, Opaque Rock