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Azurite


Mineral: Azurite, Malachite
Chemistry: Cu3(CO3)2(OH)2
Size: 90 mm
Owner: Harvard University (Karabacek Collection)
Photographer: Malcolm Southwood

Lustrous, tabular, terminated prisms of blue-black azurite (to 55 mm) with some very localised and slight alteration to malachite. The matrix consists largely of azurite crystals although with a little malachite and typical earthy, yellowish-green arsenate material. 

 

This is specimen # 1817 in the Karabacek Collection (MGMH # 93545), and possibly the finest azurite in the Karabacek suite, although the roots of one or two broken crystals are present at the centre of the specimen.  

 

The provenance dates the specimen unequivocally to the first oxidation zone; indeed, the habit of the crystals is broadly similar to material from the Gordon/Kegel pocket and there is a possibility that this is a stray specimen from that occurrence.

Courtesy  of  the  Mineralogical  &  Geological  Museum  at  Harvard  University, Azurite; MGMH  ID# 93545, Tsumeb; Namibia. @ copyright 2012, President and Fellows of Harvard College. All rights reserved.