Smoky quartz shows many different habits and crystallographic forms, but needle-like crystals of smoky color are not known. Crystals that grew at relatively high-temperatures, in particular macromosaic quartz crystals like those found in pegmatites and alpine-type fissures are often evenly colored, whereas crystals from other environments often show a color zonation in the form of multiple phantoms. In scepters and skeleton quartz the color may be more intense along the edges of the crystal.
Physical Properties:
Lustre: Vitreous
Transparency: Transparent, Translucent
Colour: gray, brown, black. Dichroic: darker yellow-brown to lighter red-brown
Hardness: 7 on Mohs scale
Tenacity: Brittle
Cleavage: None
Fracture: Conchoidal Not intended for children under 3