Schorl and Smoky Quartz – NERS 016

Measurements:  64 x 44 x 17 mm

Description:  This specimen appears to be dull at first, but then, if you tilt it in light, you'll see many small, shiny schorl facets, on both sides (difficult to photograph!). It has some (damaged) smoky quartz crystals attached to it, and bits of feldspar. 

It has pressure marks, but also quite a bit of damage, especially to the sides.

Weight of Specimen:  50 g

Chemical Composition:  NaFe²⁺₃Al₆Si₆O₁₈(BO₃)₃(OH)₄  (schorl) 
                                       SiO₂  (quartz)
                                       KAlSi₃O₈  (feldspar)  

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

Location:  Erongo Mountains, Erongo Region, Namibia.

Specimen Code:  NERS 016

US $ 25