Schorl Crystal Group – NERS 025

Schorl crystal group

Measurements:  60 x 53 x 48 mm  

Description:  A group of schorl crystals, with the main one having a prominent "Mercedes sign" termination. To the side and bottom are bits of whitish and brownish feldspar.

The main schorl crystal has minute to small nicks to the termination edges, and pressure / contact marks and nicks to the lower parts. On one of the facets are marks that were probably caused by tools while removing it from the pocket (image upper right). Some of the smaller crystals are damaged. 

Weight of Specimen:  185.2 g   

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

Hardness on Mohs Scale:  (schorl)  7.5
                                          (feldspar)  6 - 6.5
Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NERS 025


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