Chemistry: Cu3(CO3)2(OH)2
Size: 95 mm
Owner: Harvard University (Karabacek Collection)
Photographer: Malcolm Southwood

A fine group of striated, flattened, composite crystals of azurite (to c. 65 mm) on a shard of matrix rich in copper secondaries.  These composite azurite crystals exhibit interesting stepped terminations as a result of the differential parallel growth of the individuals that comprise them.  A little of the matrix material, with small crystals of smithsonite (?), cerussite, and microcrystalline malachite, adheres to the termination of the largest crystal group.

This specimen is number 4337 in the Karabacek collection, which dates it to the first oxidation zone.

Courtesy  of  the  Mineralogical  &  Geological  Museum  at  Harvard  University,  Azurite; MGMH  ID# 93562, Tsumeb; Namibia. @ copyright 2012, President and Fellows of Harvard College. All rights reserved.