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Chalcedony with "Calcite flower" from Minas Gerais provence in Brazil.
Chalcedony's chemical formula: SiO2
Mohs scale: 7
Minerals: Chalcedony, calcite.
Chalcedony with "Calcite flower" from Minas Gerais provence in Brazil.
Chalcedony's chemical formula: SiO2
Mohs scale: 7
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