Quartz Crystals with Prehnite, Epidote and Calcite on Matrix - NBB 034

Crystals of quartz, prehnite, epidote and calcite on matrix

Measurements:  40 x 24 x 23 mm

Description:  A lovely arrangement of quartz crystals with scores of small prehnite crystals on small epidote and calcite crystals. 

Some of the quartz crystals are up to 19 mm long, and a few are double terminated. There are a few minute specks and threads of hematite visible, as well as a very faint hint of amethyst colouring.

The epidote is in two different colours (perhaps a different mineral?). 

There is very little damage to this specimen.

Weight of Specimen:  76.2 g

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

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

Location:  Brandberg, Namibia.

Specimen Code:  NBB 034

US $ 120





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