Calcite and Duftite (or Mottramite) - NTS 022

Measurements:  68 x 47 x 21 mm

Description:  Lovely, sparkling calcite crystals with vivid green botryoidal duftite (or mattramite?) on a (to us, unknown) rock matrix. 

The top of the specimen has only a few small nicks, while the bottom has a few contact marks and nicks, but with vivid green duftite (or mottramite)

Weight of Specimen:  59.6 g

Chemical Composition:  CaCO₃  (calcite)                                                                                   PbCu(AsO₄)(OH)  (duftite)

Hardness on Mohs Scale:  (calcite)  3 
                                          (duftite)  4½ 

Location:  Tsumeb, Northern Namibia.

Specimen Code:  NTS 022

US $ 65