Hyalite Opal on Schorl and Quartz – NAM 010

Hyalite opal on schorl and quartz

Measurements: 117 x 70 x 65 mm

Description: Hyalite opal (which fluoresces under ultraviolet light) with bits of feldspar, sit on a schorl and smoky quartz specimen.

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

Weight of Specimen: 388 g

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

Hardness on Mohs Scale:  (basic opal) 5.5 - 6
      (feldspar)  6 - 6.5
(schorl) 7.5
   (quartz) 7

Location: Erongo, Namibia.

Specimen Code: NAM 010

R 400

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