Schorl Crystal Group with Multiple Terminations NERS 005

Schorl crystal group with multiple terminations

Measurements:  107 x 62 x 50 mm

Description:  A group of multi-terminated schorl (variety foitite) crystals with a glossy, jet-black colour, partially coated with feldspar and a piece of quartz conglomerate. The only notable damage is a contact mark at the one end of the specimen.

Weight of Specimen:  408 g

Chemical Composition:  NaFe2+3Al6Si6O18(BO3)3(OH)4  (schorl)
                                       SiO2  (quartz)            
                                       KAlSi3O8  (feldspar)                              

Hardness on Mohs Scale:  (schorl)  7.5
                                          (quartz)  7 
 6 - 6.5

Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NERS 005

US $ 200 

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