SnO2Tetragonal
Cassiterite
SnO2
OxidesChemical FormulaSnO2
Crystal SystemTetragonal
Mohs Hardness7
Specific Gravity7.04
ColorBlack, brown, yellow
LusterAdamantine to metallic
StreakWhite to brownish
CleavageTwo directions
FractureConchoidal to uneven
Occurrence
Primary ore of tin. Found in granite pegmatites and alluvial deposits.