Mineral: Azurite, Malachite
Chemistry: Cu3(CO3)2(OH)2
Size: 100 mm
Owner: Harvard University (Karabacek Collection)
Photographer: Malcolm Southwood

An impressive group of lustrous, striated, blue-black azurite crystals on a small plate of yellowish matrix.  There is just a very little - almost incipient - alteration to malachite close to the crystal terminations (i.e. distal to the matrix contacts).  The main crystal is doubly terminated and fully 100 mm in length. Sadly, there is a little bruising on one or two of the crystals, but this is a very fine azurite by any standards.

The specimen is from the Karabacek collection (Harvard University; number MGMH 93536), which dates it to the first oxidation zone.

Courtesy  of  the  Mineralogical  &  Geological  Museum  at  Harvard  University,  Azurite; MGMH  ID# 93536, Tsumeb; Namibia. @ copyright 2012, President and Fellows of Harvard College. All rights reserved.