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Smoky quartz
Gemstone
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Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. Wikipedia
Hardness (Mohs hardness scale): ≥ 7
Cleavage: Indistinct
Crystal habit: 6-sided prism ending in 6-sided pyramid (typical), drusy, fine-grained to microcrystalline, massive
Crystal system: α-quartz: trigonal trapezohedral class 3 2; β-quartz: hexagonal 622
Fracture: Conchoidal
Melting point: 1670 °C (β tridymite) 1713 °C (β cristobalite)
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