Quartz and Epidote Crystals with Calcite and Prehnite on Matrix - NBB 029

Measurements:  92 x 49 x 43 mm

Description:  Quartz crystals (the largest 28 x 07 x 06 mm) share a basalt matrix with small, drusy epidote crystals, calcite and one small piece of prehnite.  

The largest quartz crystal has a small nick and a few smaller crystals have a few very small nicks. 

Weight of Specimen:  99 g

Chemical Composition:  SiO2  (quartz
                                      Ca2(Fe3+, Al)3(SiO4)3(OH)  (epidote)                                                                             CaCO3  (calcite
                                      Ca2Al2Si3O10(OH) (prehnite)                   

Hardness on Mohs Scale:  (quartz)  7
                                          (epidote)  7
                                          (calcite)  
3
                                          (prehnite) 6-6.5
 

Location:  Brandberg, Namibia.

Specimen Code:  NBB 029

US $ 65

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