Polylithionite

polylithionite

steenstrupine-(Ce)

tainiolite

natrolite

Images

Formula: KLi₂AlSi₄O₁₀F₂
Phyllosilicate (sheet silicate), trioctahedral mica group mica group, forms a series with trilithionite and with siderophyllite, lithium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.58 to 2.82 measured, 2.84 calculated
Hardness: 2 to 3
Streak: White
Colour: White, grey, violet, light green, pinkish
Common impurities: Ti,Fe,Mn,Mg,Ca,Na,H₂O
Environments:

Pegmatites

Polylithionite occurs in syenite pegmatites in alkaline rocks (Webmin).

Localities

At Minas Gerais, Brazil, polylithionite pseudomorphs after tourmaline have been found (KL p237).

At the Lovozero massif, Russia, polylithionite occurs as a late-stage and metasomatic replacement mineral, in syenite pegmatites, associated with microcline, natrolite, tainiolite, steenstrupine-(Ce), aegirine, analcime and epistolite (HOM).

At the type locality, the Kangerluarsuk Fjord, Ilímaussaq complex, Greenland, Denmark, polylithionite occurs in a syenite pegmatite (Dana).

At Mont Saint Hilaire, Quebec, Canada, polylithionite occurs with tainiolite in pegmatites and rarely in marble xenoliths (Dana).

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