Schorl Crystal Group with Multiple Terminations – NERS 011

Measurements:  86 x 63 x 52 mm

Description:  A group of schorl (variety foitite) crystals with a shiny, jet-black colour, multiple terminations and a generous sprinkling of white to brownish feldspar. It has a small piece of quartz conglomerate attached. 

The only damage is a few small nicks and damage where it parted from its matrix.

Weight of Specimen:  280.6 g

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

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

Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NERS 011

US $ 125