Cluster of Quartz, Prehnite, Analcime and Epidote Crystals on Matrix - NBB 183

Description:  A cluster of gemmy, clear quartz crystals (up to about 12 mm long), together with light green prehnite crystals (up to about 5 mm wide) and very small aggregates of gemmy, green epidote, all with a delicate sprinkling of hundreds of minute, glass clear analcime crystals, sit on a matrix of basalt rock. 

This amazing arrangement of minerals is from a very recent find. Damage is absolutely minimal.

Weight of Specimen:  70.1 g

Chemical Composition:   SiO₂  (quartz)
                                      Ca₂Al₂Si₃O₁₀(OH)₂  (prehnite)  
                                      NaAl(Si₂O₆)•(H₂O)  (analcime)                                                          Ca₂Fe³⁺_2.25Al_0.75(SiO₄)₃(OH) (epidote)       

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

Location:  Brandberg, Namibia.

Specimen Code:  NBB 183

US $ 450