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Identity HelpIs it truly vorobyevite beryl rosterite crystals?

15th Feb 2020 08:00 UTCSamir Ahmad

09752650015817533602486.jpg
It has quartz and tourmaline crystal.

15th Feb 2020 08:35 UTCIan Nicastro

Blue beryl from this locality was originally described as vorobyevite, however, analysis has shown no noticeable Cs level (but with higher levels of Na and Ca) so it is essentially an alkali-rich beryl. See http://www.mindat.org/mesg-11-310231.html and http://www.mindat.org/forum.php?read,105,351767,page=1. Analyses of rosettes of tabular aquamarine from "Kuran, district Wamunjan" (probably from Deo Darrah) reported in Weerth & Weiß (2016) show, apart from Na, increased levels of iron (~1.5 wt.% FeO) and cesium (~0.15 wt.% Cs2O), plus traces of scandium (~0,01 wt.% Sc2O3).
The above info is from the entry for Deo Darrah, Khash & Kuran Wa Munjan Districts, Badakhshan, Afghanistan, on mindat. So the correct term to use is Alkali Beryl, not Vorobyevite for this material. 

15th Feb 2020 08:37 UTCNick Gilly

From what I've read it's alkali beryl with appreciable amounts of sodium, lithium and traces of scandium. It would have to have appreciable caesium to be called vorobyevite, and I don't think these specimens do. Variety name would therefore be aquamarine.
 
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