The chemical formula is SnO2. Pure cassiterite is almost colorless, but in general it is yellow brown to brownish black, adamantine luster. The streak is white, fracture is oily luster.
Molybdenite
It is a sulfide mineral with a chemical composition of MoS2, and is the most important molybdenum ore resource. It's leaden, metallic, and low in hardness.
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