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 crystal. Like other quartz gems, it is a silicon dioxide crystal.
Color: Black, Brown
Crystal system: Hexagonal crystal system
Chemical formula: SiO₂₊
Hardness (Mohs hardness scale): 7
Mineral class: Quartz
Transparency: Translucent, Transparent
This specimen is 20 x 16 x 15 inches and about 200 pounds.
The photos show the transparency with an LED light behind the crystals.
Authentic Mineral Specimen
20 x 16 x 15 Inches.
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