Prehnite and Quartz on Basalt Matrix - NBB 181

Beautiful prehnite, quartz and epidote crystals on matrix



Measurements:
 41 x 40 x 21 mm

Description:  Beautiful, gemmy, semi-transparent, light green bladed aggregates of prehnite crystals (mostly double terminated) cover drusy, small, clear quartz and prehnite crystals, as well as a few epidote crystals. The matrix is basalt, with a very thin layer of epidote. The only apparent damage is to the edges.

Weight of Specimen:  25.3 g

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

                                    Ca2Fe3+2.25Al0.75(SiO4)3(OH)  (epidote)

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

Location:  Brandberg, Namibia

Specimen Code:  NBB 181

US $ 250


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