This is the polished analcimolite sphere. Diameter 2.3″ (58mm). Weight – 8.8oz (250 grams). Origin: Russia, Khakassia.
Some information about analcimolite:
Analcimolite is a bright brown volcanic tuff composed mostly of the analcime mineral. It is easy to carve and takes good polishing. In Russia, the only deposit of this stone is located in Khakassia. Another name for this stone is iyusite, in honor of the river Iyus on which this mineral is mined.