Fluorite Crystals on Mica, Feldspar and Schorl - NERF 034

Measurements:  42 x 25 x 13 mm

Description:  Green fluorite crystals (up to 5 mm on edge), a few with bits of purple colouring, rest on a conglomerate of feldspar, mica and schorl.

There is only limited damage to the fluorite crystals at the edges of the specimen.

Weight of Specimen:  16.2 g

Chemical Composition:  CaF₂  (fluorite) 
                                       KAlSi₃O₈  (feldspar) 
                                       KAl₂(Si₃Al)O₁₀(OH_,F)₂  (mica) 
                                       NaFe²⁺₃Al₆Si₆O₁₈(BO₃)₃(OH)₄  (schorl)

Hardness on Mohs Scale:  (fluorite)  4 
                                          (feldspar)  6 - 6.5
                                          (mica)  2 - 2.5
                                          (schorl ) 7.5

Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NERF 034

US $ 35