This pretty rock is found all over the world but its biggest mines are in Brazil, Mexico, United States, Uruguay, and Madagascar. Black agate is a form of chalcedony which is another rock in the quartz family.
Black Agate
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This pretty rock is found all over the world but its biggest mines are in Brazil, Mexico, United States, Uruguay, and Madagascar. Black agate is a form of chalcedony which is another rock in the quartz family.
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