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. |