Prehnite, Calcite and Quartz - NBB 097

Measurements:  61 x 43 x 26 mm

Description:   Four balls of gemmy prehnite crystal, wit a nice green colour, sit on a matrix of calcite and quartz crystals which, in turn, sits on a small matrix of basalt, with traces op epidote.

A few of the calcite crystals have some nicks.

Weight of Specimen:  68.8 g

Chemical Composition:  Ca₂Al₂Si₃O₁₀(OH)₂  (prehnite)  
                                      SiO₂  (quartz)  
                                      CaCO₃  (calcite) 
                                 
Hardness on Mohs Scale:   (prehnite) 6-6.5
                                           (quartz)  7                                                                                             (calcite)  3                              

Location:  Brandberg, Namibia.

Specimen Code:  NBB 097

US $ 75