Quartz / Calcite Cluster - NBB 004

Quartz / Calcite Cluster with prehnite, Brandberg, Namibia

Measurements:   51 x 40 x 39 mm

Description:  A cluster of quartz and calcite crystals and one small (8 mm) prehnite crystal. The matrix is basalt, with hints of epidote.

The main feature of this lovely specimen, is the beautiful quartz crystal with garnet red hematite specks

There is damage where the specimen parted from the mother rock. The upper rightphotograph was taken in natural sunlight.

Weight of Specimen:  80.8 g

Chemical Composition:  SiO2  (quartz)  
                                        CaCO3  (calcite

                                        Ca2Al2Si3O10(OH)2   (prehnite) 

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

Location:  Brandberg, Namibia

Specimen Code:  NBB 004

US $ 125  

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