Cassiterite

Cassiterite is a mineral. Its chemical formula is SnO₂. It contains tin dioxide. It is black because of impurities. It is the main ore of tin. Its Mohs hardness is 6-7.

Cassiterite Media

Cassiterite bipyramids, edge length ca. 30 mm, Sichuan, China
Close up of cassiterite crystals, Blue Tier tinfield, Tasmania, Australia
Crystal structure of cassiterite

This short article about science can be made longer. You can help Wikipedia by adding to it.