Smithsonite
Chemical Formula	ZnCO3
Species	Carbonates
Crystal System	Trigonal
Mohs Scale	4
Specific Gravity	4.4-4.5
Color	White, grey, yellow, green to apple-green, blue, pink, purple, bluish grey, and brown
Streak	White
Luster	Vitreous, Pearly
Refractive Index	n = 1.842 - 1.850 n = 1.619 - 1.623
Diaphaneity	Translucent
Cleavage	Very GoodOn .
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Uncommon as crystals, typically botryoidal, reniform, spherulitic; stalactitic, earthy, compact massive
Geological Setting：Oxidised zones of zinc ore deposits.