Prehnite and Quartz Crystals on Basalt Matrix – NBB 058

Balls of prehnite and quartz crystals on matrix

Measurements:  52 x 41 x 28 mm

Description:  Two undamaged balls of prehnite and numerous quartz crystals (of which some are damaged) sit on a matrix of basalt, quartz and epidote.

Many of the smaller quartz crystals have very small prehnite crystals attached to them.

Hidden in a forest of small quartz crystals, is another small ball of prehnite. 

The bottom of the specimen has been trimmed.

Weight of Specimen:  57.7 g

Chemical Composition:  Ca2Al2Si3O10(OH) (prehnite)  
                                       SiO2  (quartz)
                                       Ca2Fe3+2.25Al0.75(SiO4)3(OH)  (epidote) 

Hardness on Mohs Scale:  (prehnite)  6-6.5

                                          (epidote) 7

Location:  Brandberg, Namibia.

Specimen Code:  NBB 058

US $ 65

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