Schorl and Feldspar Crystal Group – NERS 010

Schorl and feldspar crystal group

Measurements:  42 x 40 x 32 mm

Description:  A group of schorl (variety foitite) and feldspar crystals. The large feldspar crystal has bits of minute mica on its surfaces. 

The specimen has  some pressure marks and nicks.

Weight of Specimen:  47.5 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 010

US $ 30

                             

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