Prehnite Aggregate on Matrix – NBB 143

Beautiful domed aggregate of prehnite crystals on matrix

Measurements:  55 x 36 x 30 mm

Description:  A beautiful, domed aggregate of prehnite crystals shares a basalt matrix with small calcite, quartz and prehnite crystals. 

The prehnite dome (24 mm longest diameter) is undamaged, but the surrounding crystals have damage, mostly to the edges of the specimen.

Weight of Specimen:  67.8 g

Chemical Composition:  Ca2Al2Si3O10(OH)2   (prehnite) 
                                       CaCO3  (calcite) 
                                       SiO2  (quartz)

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

Location:  Brandberg, Namibia.

Specimen Code:  NBB 143

US $ 35

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