Schorl Crystal Group (Variety Foitite) with Feldspar – NERS 003

Schorl crystal group, sprinkled with feldspar

Measurements:  86 x 65 x 56 mm

Description:  A group of shiny, jet-black schorl (variety foitite) crystals, partially coated with feldspar. One end has a large (but not distracting) pressure mark, while the other end has a large contact mark.

Weight of Specimen:  311.7 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 003

US $ 65

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