Cassiterite
oxide mineral
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.
![](http://up.wiki.x.io/wikipedia/commons/thumb/9/90/Cassiterite_-_Mt_Bischoff_mine%2C_Waratah%2C_Tasmania%2C_Australia.jpg/220px-Cassiterite_-_Mt_Bischoff_mine%2C_Waratah%2C_Tasmania%2C_Australia.jpg)
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.