Libyan Desert glass- Found in the eastern Sahara desert. It is a natural glass made up of pure silica. Its origins are still a mystery with some sa...

Spinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not onl...

A rare type of amethyst, Auralite is a mixture of two to seven different minerals. Believed to have formed during a time when minerals and elements...