Hyalite Opal, Fluorite and Schorl - NAM 012

Hyalite opal, fluorite and schorl

Measurements:  78 x 45 x 38 mm 

Description:  A group of schorl (variety foitite) and fluorite crystals, with a capping of hyalite opal and bits of mica on some surfaces.

The specimen, which has relatively little damage, should fluoresce beautifully under ultraviolet light. 

Weight of Specimen:  122.4 g

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

Hardness on Mohs Scale:  (fluorite)  4
                                          (schorl) 7.5

                                          (basic opal) 
5.5 - 6 

Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NAM 012

R 450

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