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Azurite


Chemistry: Cu3(CO3)2(OH)2
Size: 47 mm
Owner: Harvard University
Photographer: Malcolm Southwood

Lustrous, striated, blue-black, pseudo-rhombohedral azurite crystals (to 15 mm), with malachite and arsentsumebite.

A photograph of this specimen is included as Figure 8 (Plate II) in the Palache and Lewis (1927) monograph on azurite crystallography, representing their “Type 4” habit:

…pseudo-rhombohedral character resulting from the equal development of m (110) and the striated negative orthodome zone.  The clinodome zone is 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 96938).

Courtesy  of  the  Mineralogical  &  Geological  Museum  at  Harvard  University,  Azurite; MGMH  ID# 96938, Tsumeb; Namibia. @ copyright 2012, President and Fellows of Harvard College. All rights reserved.