This blog is a electronic museum of my collections of antiquities, ethnographic, first editions, retro pottery from the 1950's to early 1970's, shell, mineral and gemstone specimens, fossils, postcards and other wonderful things! Comments are welcome on the objects including advice which will add to my own wonderment and knowledge.

Thursday, July 17, 2014

Mineral Specimen: Atacamite Crystal Cluster










Chemical Formula: Cu2Cl(OH)3
Provenance: La Farola Mine, PERU
Size and Weight:275 grams. Approx 10 x 5 x 2.5 cm
Atacamite is polymorphous with botallackite, clinoatacamite, and paratacamite. Atacamite is a comparatively rare mineral, formed from primary copper minerals in the oxidation or weathering zone of arid climates. It has also been reportedas a volcanic sublimate from fumarole deposits, as sulfide alteration products in black smokers and as alteration of ancient bronze and copper artefacts. It occurs in association with cuprite, brochantite, linarite, caledonite, malachite, chrysocolla and its polymorphs.

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