Prehnite, Calcite and Quartz Specimen – NBB 170

Measurements:  34 x 30 x 18 mm

Description:  A specimen consisting of a light green bladed prehnite crystal, a few well-formed calcite crystals and a few clear quartz crystals. There are a few traces of epidote at the bottom of the specimen, and the greyish mineral attached also appears to be extremely minute bits of epidote.

There is some damage to the edges of the specimen.

Weight of Specimen:  24.9 g

Chemical Composition:  Ca₂Al₂Si₃O₁₀(OH)₂  (prehnite)  
                                      SiO₂  (quartz)  
                                      CaCO₃  (calcite)                                                                                     Ca₂Fe³⁺_2.25Al_0.75(SiO₄)₃(OH)  (epidote) 

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

Location:  Brandberg, Namibia.

Specimen Code:  NBB 170

US $ 25