Smoky quartz is a dark variety of quartz(*). It takes its name from its smoky brown color. Inclusions of rutile needles are common.smoky quartz
Smoky quartz, like rock crystal, which it closely resembles, is found all over the world.
Deep brown, almost black-looking stones, also known as morions, are considered particularly precious. However, stones known commercially as morions are often lighter smoky quartz colored with X-rays or by radioactive irradiation.
It gets its dark color from millions of years of bombardment with cosmic radiation, which moves traces of embedded aluminum atoms to the position of the silicon atoms.