Group of Schorl Crystals with Multiple Terminations – NERS 004

Schorl crystal group with multiple terminations

Measurements:  122 x 81 x 45 mm

Description:  A group of schorl crystals (variety foitite) with multiple terminations and a jet-black colour, with a covering of whitish feldspar.  The only damage is two contact marks.

Weight of Specimen:  576 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 004

US $ 200 

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