Schorl with Multiple Terminations and Interesting Facets – NERS 012

Measurements:  89 x 55 x 51 mm

Description:  A group of shiny, jet black schorl (variety foitite) crystals with multiple terminations and interesting facets. The surface of the specimen is partly covered with feldspar. The bottom has some pressure marks, while there is an inconspicuous nick near the top.

Weight of Specimen:  361.9 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 012

US $ 125