Sphalerite - (Zn, Fe)S

Habit: Yellow, brown, black, less commonly red or green. When iron-free, white to colorless. Reinous to Adamantine Luster; transparent to translucent, opaque when iron-rich.

Environment: Occurs in Hydrothermal ore deposits

Etymology: From the Greek sphaleros meaning treacherous, the mineral occurs in several forms and can be mistaken for galena but doesn't yield lead. Sphalerite is the most common zinc mineral and the principal ore of zinc