Schorl and Quartz Group – NERS 021

Group of quartz crystals with schorl crystals, feldspar and (?)goethite


Measurements: 
68 x 32 x 27 mm

Description:  A schorl crystal (variety foitite) sits on a group of quartz crystals with a few small schorl crystals as well as a coating of minute (what appears to be) goethite crystals. There are also bits of feldspar.

The specimen displays well on a flat surface.

Weight of Specimen:  30.0 g  

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

Hardness on Mohs Scale:  (quartz)  7 
                                      (schorl
) 
 7.5
                                      (feldspar)
  6 - 6.5 
                                               (goethite)  5 - 5.5

Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NERS 021

US $ 35



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