Cassiterite
Chemical Formula	SnO2
Species	Oxides & Hydroxides
Crystal System	Tetragonal
Mohs Scale	6-7
Specific Gravity	6.98-7.1
Color	Black, brownish black, reddish brown, red, yellow, gray, white; rarely colorless
Streak	White to brownish
Luster	Adamantine, Greasy, Sub-Metallic
Refractive Index	n = 1.990 - 2.010 n = 2.093 - 2.100
Diaphaneity	Transparent, Translucent, Opaque
Cleavage	Imperfect/Fair imperfect, indistinct.
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Pyramidic, prismatic, radially fibrous botryoidal crusts and concretionary masses; coarse to fine granular, massive
Geological Setting：In medium- to high-temperature hydrothermal veins and greisens, alluvial placers.