Malachite Crystals from Spain
Stunning Malachite Crystals From Spain. Photo:  Christian Rewitzer

Malachite | ‪#‎Geology


Formula: Cu₂CO₃(OH)₂
System: Monoclinic
Colour: Bright green, with ...
Hardness: 3½ - 4
Streak: Light green 
From  Sol Mine, Cerro de los Guardias, Rodalquilar, Níjar, Comarca Metropolitana de Almería, Almería, Andalusia, Spain   

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. 
 
Malachite often results from the supergene weathering and oxidation of primary sulfidic copper ores, and is often found with azurite, goethite, and calcite. Except for its vibrant green color, the properties of malachite are similar to those of azurite and aggregates of the two minerals occur frequently. Malachite is more common than azurite and is typically associated with copper deposits around limestones, the source of the carbonate. 




 
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