Malachite Crystals from Spain

Malachite | ‪#‎Geology

Formula: Cu₂CO₃(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. 

From  Sol Mine, Cerro de los Guardias, Rodalquilar, Níjar, Comarca Metropolitana de Almería, Almería, Andalusia, Spain    

Photo:  Christian Rewitzer