Fluorite, Quartz, Schorl and Muscovite on Matrix – NERF 011

Measurements:  41 x 28 x 17 mm

Description:  A beautiful arrangement of quartz, fluorite, schorl and mica crystals on matrix. The quartz crystal has beautiful markings on part of its termination. Some of the thin schorl crystals are semi-transparent. 

The specimen has only a few very small nicks, including one to the quartz crystal.

Weight of Specimen:  11.3 g

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

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

Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NERF 011