Prehnite Balls with Calcite and Quartz Crystals, on Matrix - NBB 057

Prehnite and quartz on basalt matrix


Measurements:  65 x 46 x 23 mm

Description:  Three green balls of prehnite (the largest 22 x 16 mm) along with a few small calcite and clear quartz crystals, share a matrix of quartz and basalt rock.

There is some damage to the edges of the specimen.

Weight of Specimen:  62.1 g

Chemical Composition:  Ca2Al2Si3O10(OH)2    (prehnite)  
                                        SiO2  (quartz)  
                                        CaCO3  (calcite


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

Location:  Brandberg, Namibia.

Specimen Code:  NBB 057

US $ 70

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