Prehnite Balls with Quartz Crystals on Matrix - NBB 042

Measurements:  41 x 40 x 30 mm

Description:  Two stunning small balls of bladed prehnite (11 and 8 mm diameter respectively) with a few small quartz crystals, on a matrix of basalt and quartz. The prehnite is undamaged, but the main quartz crystal is damaged.

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

Location:  Brandberg, Namibia.

Specimen Code:  NBB 042

US $ 70