Yofortierite

yofortierite

serandite

eudialite

polylithionite

Images

Formula: Mn2+5Si8O20(OH)2.7H2O
Phyllosilicate (sheet silicate), palygorskite group, manganese-bearing mineral
Specific gravity: 2.18
Hardness: 2½
Streak: Light pink
Colour: Pink to pale violet, brown
Common impurities: Ti,Al,Cr,Zn,Ca,K
Environments

Pegmatites
Hydrothermal environments

Localities

At the type locality, the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, yofortierite is a late-stage hydrothermal mineral that occurs as pink to violet radiating fibres up to 3 cm long in pegmatite veins in nepheline syenite. Associated minerals include analcime, serandite, eudialyte, polylithionite, aegirine, altered microcline and albite (CM 13.68-74).

At the Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia, yofortierite is associated with kuzmenkoite-(Zn). Other minerals associated with kuzmenkoite-(Zn) here include natrolite, microcline, albite, aegirine, nepheline, arfvedsonite, sodalite, eudialyte, organovaite, beryllite, ranciéite, elpidite, catapleiite, manganoneptunite and nontronite (Minrec 35.4.356).

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