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Silver


Mineral: Silver, Chalcocite, Quartz
Chemistry: Ag
Size: 60 mm
Owner: Harvard University (Karabacek Collection)
Photographer: Malcolm Southwood

A very thin sheet of native silver, hosted in massive chalcocite-rich (?) sulphide ore.  A little quartz is associated with the silver. 

 

The silver has a crude dendritic structure – almost as if anastomosing wire silver had been squashed flat. (FOV for Photograph 2 is 30 mm.)

 

This specimen bears two Karabacek Collection numbers - 902 and 4449 - and is number MGMH 93017 in the Harvard Collection, which dates it to the first oxidation zone.  Klein (1938) noted that native silver was only found below 160 m (5 Level), and that silver was commonly associated with chalcocite between depths of 280 to 400 m (9 Level to 14 Level). 

 

Courtesy  of  the  Mineralogical  &  Geological  Museum  at  Harvard  University, Silver; MGMH  ID# 93017, Tsumeb; Namibia. @ copyright 2012, President and Fellows of Harvard College. All rights reserved.