Fragment of sphalerite-cleophane crystal, convenient for faceting

 

 

Fragment of sphalerite- cleophane crystal, with 2 cut parallel faces, what allows to be observed the internal part of the crystal, which is transparent with one inclusion of about 3-5 % of the volume. The color is colorless to light green to yellow-green and brown green.  Pictures are taken in transmitted (back) cold LED light.