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Azurite


Mineral: Azurite, Malachite
Chemistry: Cu3(CO3)2(OH)2
Size: 62 mm
Owner: Harvard University
Photographer: Malcolm Southwood

Thick, tabular crystals of blue-black azurite (to 18 mm) on altered dolostone. One of the crystals shows minor alteration to malachite.

A photograph of this specimen is included as Figure 12 (Plate II) in the Palache and Lewis (1927) monograph on azurite crystallography, representing their “Type 6” habit:

…in which the front pinacoid is surrounded by a ring of well-developed faces.  The forms a (100), m (110), σ (101), θ (-101) and c (001) are dominant, and l (023), f (011), and h (221) are prominent.”

The specimen was purchased from a Tsumeb miner (as part of a large collection) by Professor Charles Palache, during his visit to Tsumeb in April, 1922, indicating that it originated from above 8 Level (the lower limit of mine development at the time of his visit).  (Harvard University # MGHM 87490).

Courtesy  of  the  Mineralogical  &  Geological  Museum  at  Harvard  University,  Azurite; MGMH  ID# 87490, Tsumeb; Namibia. @ copyright 2012, President and Fellows of Harvard College. All rights reserved.