Fluorite Crystals with Hyalite Opal and Mica - NERF 018

Fluorite crystal group with lovely hyalite opal and mica



Measurements:  60 x 51 x 39 mm

Description:  A group of fluorite crystals grew on and over a piece of feldspar. The fluorite crystals are partly covered with a brown, hard mineral which, in turn, has a coating of hyalite opal. Some cavities contain mica and hyalite opal. 

The specimen has a few nicks to one of its sides, and a flaw.

This specimen can truly be appreciated when looked at through good magnification with a loupe.

Weight of Specimen:  134.9 g

Chemical Composition:  CaF2  (fluorite)
                                       KAl2(Si3Al)O10(OH,F)2
  (muscovite / mica
                                       SiO2•1.5(H2O)  (opal)                                     
                                       KAlSi3O8
 (feldspar)

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

Location:  Erongo Region, Namibia.

Specimen Code:  NERF 018

US $ 45

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