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Dominant species
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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.
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