Prehnite, Calcite and Quartz Crystals in Geode - NBB 133

Measurements:  69 x 57 x 38 mm

Description:  Two aggregates of prehnite crystals share a geode cavity with calcite and quartz crystals. The matrix is basalt, and has been trimmed. 

The larger prehnite aggregate has no damage, while the smaller one has a small contact mark. The only other notable damage is to the edges of the geode. 

Weight of Specimen:  207.5 g

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

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

Location:  Brandberg, Namibia.

Specimen Code:  NBB 133

US $ 75

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