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a. A dense, usually gray, chertlike siliceous rock, in which chalcedony or
cryptocrystalline quartz has replaced the carbonate minerals of limestone
or dolomite; a silicified limestone. It typically develops as the gangue
of metasomatic sulfide deposits of the lead-zinc type, such as those of
Missouri, Oklahoma, and Kansas. AGI
b. Resembling jasper. AGI
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