Tokkoite, charoite, aegirine

Short description: Tokkoite is a calcium and potassium inosilicate mineral with hydroxyl and fluorine. It was first discovered at the Magistralny site on the right side of the Davan stream valley, in the southeastern part of the Murun alkaline complex, Siberia. It forms nearly monomineralic vein-like zones with a thickness of up to 20–50 cm. It is found in association with charoite, aegirine, and pectolite.

Locality: Sirenevyi kamen’ (Lilac stone) deposit, Murun Massif (Murun Alkaline Complex), Olekminsky District, Southern Yakutia, Yakutia, Russia

Dimensions: 2.8 inch × 1.6 inch × 0.9 inch (72 mm x 40 mm ×24 mm)
Weight: 71 g (2.5 oz)