Smoky Quartz is named after its smoky colour. The colour varies from brown to black and sometimes smoky grey. Sunglasses, in the form of flat panes of smoky quartz were used in China in the 12th century.
Metaphysically, it is considered a stone of endurance, and enhances organizational abilities.
It is 7 on the Mohs scale.
This smoky quartz comes from Brazil.