Smoky Quartz

Appearance:

Transparent; smoky grey or brown-to-black

Esoteric beliefs and associations...

Stones containing strong traces of brown are often used for the healing of sick or injured animals.

Physical properties...

Chemistry	Silicon dioxide
System/Structure	Hexagonal (prisms)
Refractive Index	1.544 - 1553
Specific Gravity	2.65
Mohs' Hardness	7