Charoite tumbled from Ukraine

The mineral charoite is a hydrated potassium-calcium-silicate with the chemical formula (K, Na) 5 (Ca, Ba, Sr) 8Si6O15Si6O16 (OH, F) · H2O. It belongs to the inosilicaten. The light brown, purple or purple to charoite has a glass pearl gloss, a good color and a white stripe in accordance with unknown crystal cleavage planes. The average density is 2.56 and the hardness is from 5 to 6. The crystal system is monoclinic, and the radioactivity of the mineral is barely measurable. The gamma ray value according to the American Petroleum Institute is 154.18. The name of the mineral Charoite is derived from the river Chara in Siberia. The mineral Charoite occurs in a syenite massif where through contact metamorphosis of approximately 200 - 250 degrees Celsius is converted limestone. The type of location is the Murun massif, Chara River area, Aldan Shield, southwest Yakutia. Charoite occurs here along with dark green aegiriennaalden, yellow and green tenaksiet white nepheline.