Quartz Crystals with Prehnite, Epidote and Calcite on Matrix - NBB 034

Measurements:  40 x 24 x 23 mm

Description:  A lovely arrangement of quartz crystals with scores of small prehnite crystals on small epidote and calcite crystals. 

Some of the quartz crystals are up to 19 mm long, and a few are double terminated. There are a few minute specks and threads of hematite visible, as well as a very faint hint of amethyst colouring.

The epidote is in two different colours (perhaps a different mineral?). 

There is very little damage to this specimen.

Weight of Specimen:  76.2 g

Chemical Composition:  SiO₂  (quartz)
                                       Ca₂Al₂Si₃O₁₀(OH)₂  (prehnite)  
                                       Ca2(Fe³⁺, Al)3(SiO₄)₃(OH)  (epidote)    
                                       CaCO₃  (calcite)                         

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

Location:  Brandberg, Namibia.

Specimen Code:  NBB 034

US $ 120