Chkalovite

chkalovite

ussingite

sodalite

eudialyte

Images

Formula: Na2BeSi2O6
Inosilicate (chain silicate)
Specific gravity: 2.662
Hardness: 6
Streak: White
Colour: White
Common impurities: Fe,Ca,K,S
Environments

Plutonic igneous environments
Pegmatites

Localities

At the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, chkalovite occurs as rare mm-sized crystals in sodalite xenoliths in an intrusive alkalic gabbro-syenite complex. Associated minerals include villiaumite, ussingite, sodalite, aegirine, lovozerite, vuonnemite, serandite, lueshite and steenstrupine-(Ce) (HOM, Dana).

At the type locality, the Malyi Punkaruaiv Mountain, Lovozersky District, Murmansk Oblast, Russia, chkalovite is found in ussingite veinlets in pegmatite in the alkaline massif. Associated minerals include schizolite, sphalerite, manganoan pectolite, microcline, sodalite, eudialyte and neptunite, as well as ussingite (AM 25.380, HOM).

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