Hyalite Opal, Feldspar and Schorl – NAM 024

Measurements:  55 x 37 x 33 mm

Description:  Hyalite opal and feldspar sit on a group of schorl crystals. The hyalite opal fluoresces under ultraviolet light.

The specimen has a few contact / pressure marks and nicks. 

Weight of Specimen:  64 g

Chemical Composition:  SiO2•1.5(H2O)  (opal)             
                                       KAlSi₃O₈  (feldspar)
                                       NaFe²⁺₃Al₆Si₆O₁₈(BO₃)₃(OH)₄  (schorl)

Hardness on Mohs Scale:  (opal)  5.5-6
                                          (feldspar)  6 - 6.5
                                   (schorl)  7.5   

Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NAM 024