Prehnite, Quartz and Calcite Crystals on Matrix – BARG 033

A small, well-formed prehnite crystal with other crystals on matrix

Measurements:  47 x 40 x 18 mm

Description:  A small, well-formed prehnite crystal (8 mm in diametre) shares a (trimmed) basalt matrix with a few clear quartz crystals and calcite. On the surface of some of the quartz crystals are a few very minute dark bits, which appear to be epidote.

The only notable damage is to the edges of the specimen.

Weight of Specimen:  35.1 g

Chemical Composition:  Ca2Al2Si3O10(OH)  (prehnite)  
                                       SiO2  (quartz)  
                                       CaCO3  (calcite


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

Location:  Brandberg, Namibia.

Specimen Code:  BARG 033

US $ 15

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