Malachite | ‪#‎Geology

Formula: Cu2(CO3)(OH)2
System: Monoclinic
Colour: Bright green, with ...
Hardness: 3½ - 4
Streak: Light green
Malachite is a green, very common secondary copper mineral with a widely variable habit. Typically it is found as crystalline aggregates or crusts, often banded in appearence, like agates. It is also often found as botryoidal clusters of radiating crystals, and as mammillary aggregates as well.

Azurite

 Formula: Cu3(CO3)2(OH)2
System: Monoclinic
Colour: Azure blue, blue, light ...
Lustre: Vitreous
Hardness: 3½ - 4
A secondary copper mineral frequently found in the oxidized zones of Cu-bearing ore deposits

credit photo to R.Weller/Cochise College.
Gemstones courtesy of Starborn Creations
Sedona. Arizona

 
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