Quartz with Arsenopyrite
Mine, Hexigten Banner (Keshiketeng Co.), Ulanhad League (Chifeng
Prefecture), Inner Mongolia Autonomous Region, China
3.8x 3.0 cm
A milky white quartz crystal associated with
multiple arsenopyrite crystals.
I also purchased a larger specimen of this
material, during trimming I noticed that the portions of the
quartz crystals overgrown by arsenopyrite (which I knocked off
during the trimming of that specimen) were transparent.
Based on this, it would seem that these quartz crystals were
originally clear, then later overgrown by arsenopyrite. At
some point these quartz crystals came into contact with another
solution that etched those portions not shielded by the
arsenopyrite overgrowth. The result are these white quartz