This is the polished tinaksite egg. Dimensions: 2.6 x 1.7″ (6.6 x 4.4cm). Weight – 6.7oz (189 grams). Origin: Russia, Siberia.
Some information about tinaksite:
Tinaksite is a mineral found in northern Russia. Tinaksite can be grayish-white, yellowish, orange, or brown, and it is often found in charoite. Its name is derived from its composition: titanium (Ti), sodium (Na) potassium (K) and silicon (Si). International Mineralogical Association first recognized tinaksite as a mineral in 1965.