General Information:
Chemical Formula:(Zn,Cu)5(CO3)2(OH)6
Composition:(Molecular Weight = 546.71 gm)Zinc 44.85 %
ZnCopper 14.53 %
CuHydrogen 1.11 %
H Carbon 4.39 %
C Oxygen 35.12 %
O Empirical Formula: Zn3.75Cu1.25(CO3)2(OH)6
Environment:Secondary mineral in copper and zinc deposits.
IMA Status:Approved IMA 1963
Locality:Salida, Chaffee Co., Colorado, USA.
Name Origin:Probably from the Greek oreichalchos, "mountain copper."
Physical Properties: Cleavage:[010] Perfect
Color:pale green, sky blue, or greenish blue.
Density:3.64 - 3.9, Average = 3.77
Diaphaniety:Transparent
Habits:Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces., Encrustations - Forms crust-like aggregates on matrix., Acicular - Occurs as needle-like crystal s.
Hardness:2 - Gypsum
Luminescence:None.
Luster:Pearly
Streak:light blue
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