Fluornatromicrolite, Var. Bismutomicrolite
 
From Malkhan pegmatite field, Krasny Chikoi, Chitinskaya Oblast, Russia
 
This lustrous greenish-brown single crystal of Fluornatromicrolite shows a big amount of Bismuth
and can be considered as the variety Bismutomicrolite
 
Dimension : 0.5 x 0.5 x 0.5 mm