Quartz Crystal with Analcime and Prehnite – NBB 089

Lovely quartz crystal with four different types of crystals on the surface



 Measurements:  37 x 14 x 13 mm

Description:  A lovely, clear quartz crystal with faint clouds of smoky and amethyst colouring. The crystal has lovely gas inclusions and four different types of crystals on the surface -  lovely water-clear analcime crystals, unusually shaped prehnite crystals, calcite and minute, very gemmy, green crystals (possibly epidote). Other than minute nicks, no apparent damage.

Chemical Composition:  SiO2  (quartz)
                                    NaAl(Si2O6)•(H2O)  (analcime)
                                    Ca2Al2Si3O10(OH)2 (prehnite)
                                    CaCO3   (calcite)                                                                                                     Ca2Fe3+2.25Al0.75(SiO4)3(OH)  (epidote) 

Hardness on Mohs Scale:  (quartz)  7
                                      (analcime)  5
                                      (prehnite)  6-6.5
                                      (calcite)  3
                                      (epidote)  7

Location:  Brandberg, Namibia.

Specimen Code:  NBB 089

US $ 65