This is the blue violane pebble. Dimensions: 2.2 x 1.5 x 1.1″ (5.7 x 3.8 x 2.7cm). Weight – 3.2oz (92 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.