- Blue Alkali Beryl
- Thumbnail, 2.3 x 1.9 x 1.4 cm
- Deo Darrah, Khash & Kuran Wa Munjan Districts, Badakhshan Province, Afghanistan
An aesthetic cluster of tabular, lustrous and translucent, sky blue alkali-rich beryl crystals is perched on a sliver of matrix. The largest crystal is doubly terminated and 1.6 cm across. Superb thumbnail! These were originally thought to be Rosterite or Vorobyevite, but further analysis by Dr. Federico Pezzotta confirmed they are alkali-rich beryls.