Black Chalcedony
Black Chalcedony is a variety of Chalcedony. The black hues are due to inclusions/impurities within the Chalcedony. Chalcedony is commonly found with Zeolite minerals, Calcite, and Apophyllite.
Hardness: 6½ - 7
Luster: Waxy, Dull
Formula: SiO2
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