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chert punika hard, peteng, opaque rock sedimentary kang dumadi saka silika karo susunan nggoleki-grained amorf
saka quartz Flint-kaya, 1670s, diweruhi origin- istilah lokal, kang wis dijupuk menyang nggunakake geologi
rock grained nggoleki, rock opaque
diabase punika rock igneous nggoleki-grained kang dumadi saka biasane pyroxene lan Feldspar
christian Leopold von Buch
rock grained nggoleki, medium rock grained, rock opaque