Prehnite, Calcite and Quartz Crystals on Matrix - NBB 032

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, which is mostly confined to its edges.

Weight of Specimen:  54.4 g 

Chemical Composition:  Ca₂Al₂Si₃O₁₀(OH)₂  (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

.
.
..

.