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Jasper
Gemstone
Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to... Wikipedia
Hardness (Mohs hardness scale): 6.5 – 7
Chemical formula: SiO₂
Mineral chemical formula: SiO2
Category: Mineral
Cleavage: Indiscernible
Crystal system: Hexagonal