Prehnite, Calcite and Quartz Crystals on Matrix - NBB 032

Prehnite, calcite and quartz on matrix

Measurements:  61 x 46 x 30 mm

Description:  A specimen consisting of pale green prehnite, calcite and quartz crystals on a basalt matrix. There are whitish crystals on the specimen which could possibly be another mineral (unknown to us), or perhaps very pale prehnite. 

The specimen has little damage, whice is mostly confined to its edges.

Weight of Specimen:  54.4 g 

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

                                 

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


Location:  Brandberg, Namibia.

Specimen Code:  NBB 032

US $ 95

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