Schorl Specimen (Variety Foitite) with Feldspar – NERS 024

Measurements:  74 x 65 x 56 mm  

Description:  A large group of schorl (variety foitite) crystals with multiple terminations. The crystals have a shiny, jet-black colour and are partially covered with feldspar.  

The specimen has no notable damage.

Weight of Specimen:  316 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 024