Nenadkevichite

nenadkevichite

serandite

catapleiite

epididymite

Images

Formula: (Na,☐)8Nb4(Si4O12)2(O,OH)4.8H2O
Cyclosilicate (ring silicate), labuntsovite group
Specific gravity: 2.78 to 2.885
Hardness: 5
Streak: White, very light rose-pink
Colour: Rose-pink, very light pink, light yellow, brown, dark brown due to inclusions
Solubility:
Common impurities: Al,TR,Fe,Mn,Mg,Ba
Environments:

Pegmatites

Nenadkevichite occurs in altered and unaltered pegmatites and very rarely in cavities in marble xenoliths and igneous breccia. It is an alteration product of epistolite (Dana).

Localities

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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