Schorl Crystal with Feldspar – NERS 027

Schorl crystal (variety foitite) with minute schorl crystals on its surface

Measurements:  53 x 33 x 27 mm  

Description:  A schorl crystal (variety foitite) with very small schorl crystals on its surface, and bits of quartz and feldspar on some surfaces. 

The specimen has a few nicks and hairline flaws.

Weight of Specimen:  78.3 g   

Chemical Composition:  NaFe2+3Al6Si6O18(BO3)3(OH)4  (schorl)
                                       KAlSi3O8  (feldspar)      
                                       SiO2  (quartz)    
                        
Hardness on Mohs Scale:  (schorl)  7.5
                                          (feldspar)  6 - 6.5
                                          (quartz)  7
                                     
Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NERS 027

US $ 18
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