Cyclosilicate (ring silicate), labuntsovite group
Specific gravity: 2.78 to 2.885
Streak: White, very light rose-pink
Colour: Rose-pink, very light pink, light yellow, brown, dark brown due to inclusions
Common impurities: Al,TR,Fe,Mn,Mg,Ba
Nenadkevichite occurs in altered and unaltered pegmatites and very rarely in cavities in marble
xenoliths and igneous breccia. It is an alteration product of
At Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, nenadkevichite occurs in pegmatites, cavities in igneous breccia, hornfels and marble xenoliths in an intrusive alkalic gabbro - syenite complex. Associated minerals include microcline, aegirine, catapleiite, ancylite, epididymite, eudialyte, serandite, pectolite, apophyllite, monteregianite and vesuvianite (HOM).
At the type locality, Natrolite Stock, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia, nenadkevichite occurs between crystals of microcline in a pegmatite rich in natrolite and albite, in nepheline syenite (AM 40.1154, HOM).
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