Prehnite, Quartz and Calcite - NBB 098

Ball of bladed prenite with quartz and calcite

Measurements:  47 x 40 x 16 mm

Description:  A specimen consisting of a lovely ball of bladed prehnite (18 mm across) and several calcite and clear quartz crystals, along with the remains of a small piece of basalt matrix.

The prehnite appears to be without damage, while there is some damage to the quartz and calcite crystals, and to the edges of the specimen. There are a few pressure and contact marks to some of the quartz and calcite crystals.

Weight of Specimen:  25.3 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:  NBB 098

US $ 35



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