Quartz Crystal with Fascinating Gas Inclusions - NBB 076

Lovely quartz crystal with fascinating gas inclusions

Measurements:  59 x 17 x 16 mm

Description:  A clear quartz crystal with faint amethyst colouring in the lower part, and clouds of smoky colouring in the upper half. It has fascinating gas inclusions and small (very pale green) prehnite and a few analcime crystals on the surface.

The crystal's termination point has a few very small nicks, there is a nick and contact mark just below the termination facets and damage at the base where it parted from its matrix at a sharp angle.

Weight of Specimen:  26.3 g 

Chemical Composition:   SiO2  (quartz)
                                        Ca2Al2Si3O10(OH)2  (prehnite)  
                                        NaAl(Si2O6)•(H2O)  (analcime)     

Hardness on Mohs Scale:  (quartz)  7      
                                          (prehnite)  6-6.5                                                                         
                           (analcime) 5  

Location:  Brandberg, Namibia.

Specimen Code:  NBB 076


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