Balls of Prehnite with Quartz Crystal, on Matrix – NBB 049

Balls of prehnite and quartz crystals on matrix

Measurements:  68 x 53 x 45 mm

Description:  A few balls of green bladed prehnite ( 26 x 26 mm) are clustered together around the base of a lovely clear quartz crystal, that have several minute red and blueish hematite specks inside. There are also several smaller and lesser quartz crystals, as well as a few calcite crystals, of which the largest measures about 14 mm across. These all share a matrix of basalt rock.

The main quartz crystal has only a few extremely minute nicks (hardly visible to the naked eye) to its termination, and the prehnite appears to be undamaged. A few of the lesser crystals have some damage, especiallly to the edges of the specimen.

Weight of Specimen:  94.9 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 049

US $ 75

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