Smithsonite
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Smithsonite, also known as zinc spar, is the mineral form of zinc carbonate. Historically, smithsonite was identified with hemimorphite before it was realized that they were two different minerals. The two minerals are very similar in appearance... Wikipedia
Density: 4.4 - 4.5
Cleavage: Perfect on
Color: White, grey, yellow, green to apple-green, blue, pink, purple, bluish grey, and brown
Crystal class: Hexagonal scalenohedral (3m); H-M symbol: (3 2/m)
Crystal habit: Uncommon as crystals, typically botryoidal, reniform, spherulitic; stalactitic, earthy, compact massive
Crystal system: Trigonal
Formula (repeating unit): ZnCO3