Blue Alkali Beryl
Thumbnail, 2.2 x 1.7 x 1.0 cm
Deo Darrah, Khash & Kuran Wa Munjan Districts, Badakhshan Province, Afghanistan
This is a tabular, doubly terminated, lustrous and translucent, sky blue alkali-rich beryl crystal. It is cleaved on bottom, but displays well. These were originally thought to be Rosterite or Vorobyevite, but further analysis by Dr. Federico Pezzotta confirmed they are alkali-rich beryls.