Quartz Crystals with (?)Prehnite – BARG 009

Quartz and calcite crystals on basalt matrix.

Measurements:  78 x 47 x 23 mm

Description:  A large, multi-terminated quartz crystal with bits of hematite in some of the terminations, sits on a group of quartz crystals with (what appears to be) prehnite, and feldspar clay. There are interesting patterns on some of the shaft and termination facets.

The main crystal's termination has interesting growth patterns. The termination has a small nick, while the rest of the specimens has only a few nicks. 

Weight of Specimen:  60.9 g

Chemical Composition:  SiO2  (quartz)   
                                       KAlSi3O8  (feldspar)
                                       Ca2Al2Si3O10(OH)2  (prehnite) 

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

Location:  Northern Cape, South Africa.

Specimen Code:  BARG 009


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