This is the polished on the both sides blue violane slice. Dimensions: 2.4 x 1.8 x 0.1″ (6.1 x 4.5 x 0.2cm). Weight – 0.5oz (13 grams). Origin: Russia, Transbaikalia.
Some information about violane:
Violane is a variety of the diopside mineral bluish tones. Violane color is due to admixture of manganese and iron. Contains 10% jadeite and aegirine components.
Known deposits from Italy (Saint-Marcel, Piedmont) and Russia. In Russia deposits are located in the Transbaikalia, Altai and Sayan.