This stone is charoite and it takes its name from the river Chara in Russia. This is the only place it was found. As I've heard everything that could be taken had been taken out of the mine. Funny enough I tried to buy some charoite while I was in Russia for a trip, as I thought it would be cheaper there (Australian opal and Australian chrisoprase was cheaper in Australia!). Well, Russian charoite is more expensive in Russia than anywhere else! Go figure... So I bought mine on ebay :) (the color in the picture is not quite right, it looks a bit darker here than in real life).
The shape is nice, but rather unusual. I thought it would fit an organic Art Nouveau design.