Fluorite Crystal Group with Mica, Schorl and Hyalite Opal - NERF 005

Fluorite crystal group with mica, schorl and hyalite opal

Measurements:  85 x 57 x 50 mm

Description:  An interesting group of fluorite crystals with bits of schorl and mica. Some parts of the specimen have a thin coating of green hyalite opal. 

The specimen has very little damage, mostly confined to the bottom, which also has a piece of feldspar matrix.

Weight of Specimen:  251.0 g 

Chemical Composition:  CaF2  (fluorite)
                                        KAl2(Si3Al)O10(OH,F)2
  (muscovite
                                        NaFe2+3Al6Si6O18(BO3)3(OH)4  (schorl)   
                                        SiO2•1.5(H2O)  (opal)                                     
                                        KAlSi3O8
 (feldspar)

Hardness on Mohs Scale:  (fluorite)  4
                                           (muscovite) 2-2.5
                                           (schorl) H: 7.5                
                                           (opal) H: 
5.5-6     
                                           (feldspar)
  6 - 6.5

Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NERF 005

US $ 150

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