Collection: Aurichalcite

Formula: (Zn,Cu)₅(CO₃)₂(OH)₆     (Zn:Cu ratio is about 5:2, but may approach 2:1)

Colour: Pale green, sky blue, or greenish-blue; colourless to light shades of blue or green in transmitted light

Luster: Silky, Pearly

Hardness: 1 - 2

Specific Gravity: 3.96

Crystal System: Monoclinic