Komkovite

komkovite

strontianite

georgechaoite

catapleiite

Images

Formula: BaZrSi₃O₉.3H₂O
Valence: BaZr⁴⁺Si₃O₉.3H₂O
Inosilicate (chain silicate), single chains, hilairite group, barium- and zirconium- bearing mineral
Crystal system: Trigonal
Specific gravity: 3.31 measured, 3.31 calculated
Hardness: 3 to 4
Streak: Light brown
Colour: Brown
Luminescence: No fluorescence under UV, light blue cathodoluminescence
Common impurities: Hf,Fe,Ca,K
Environments

Carbonatites

Localities

At the type locality, the Vuoriyarvi alkaline-ultrabasic massif, Northern Karelia, Murmansk Oblast, Russia, komkovite was found as equant crystals, 1-5 mm across, with trigonal pyramidal faces, in dolomitic veinlets that cut metasomatically altered pyroxenites in a carbonatite. It was found in a drill core at 80-90 m depth, associated with dolomite, strontianite, phlogopite, baryte, georgechaoite and pyrite, and apparently formed by alteration of catapleiite (AM 77.207-208, Mindat).
Komkovite from the Vuoriyarvi alkaline-ultrabasic massif - Image

Back to Minerals