Quartz and Epidote Crystals on Feldspar and Epidote Matrix - NBB 213

Measurements:  89 x 65 x 30 mm

Description:  Small, milky to clear quartz crystals, together with one larger quartz crystal (25 mm long), share a thin matrix of feldspar and epidote with small, gemmy, dark green epidote crystals.

There are also a couple of very small (weatherworn) prehnite crystals.

The specimen has very little damage and displays well. 

Weight of Specimen:  93.4 g

Chemical Composition:  SiO₂  (quartz) 
                                       KAlSi₃O₈ (feldspar)                                                                                 Ca₂Fe³⁺_2.25Al_0.75(SiO₄)₃(OH)  (epidote) 
                                        Ca₂Al₂Si₃O₁₀(OH)₂   (prehnite)   

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

Location:  Brandberg, Namibia.

Specimen Code:  NBB 213

US $ 250