cassiteritetype
Cassiterite is a tin oxide mineral with the chemical composition SnO2. It is the primary source of tin and is a common mineral found in granitic pegmatites, alluvial deposits, and hydrothermal veins. Cassiterite is a dense, black or metallic-gray mineral with a metallic luster, often exhibiting a distinct octahedral or trigonal-hexagonal crystal habit.
Cassiterite is typically found in rocks associated with granitic plutons, where it is commonly associated with
The chemistry of cassiterite involves the tin ion (Sn4+) in a tetrahedral coordination with four oxygen atoms.