Polylithionite

minerals

steenstrupine-(Ce)

tainiolite

natrolite

Images
Formula: KLi2AlSi4O10F2
Phyllosilicate (sheet silicate), mica group, forms a series with trilithionite and with siderophyllite.
Specific gravity: 2.58 to 2.82
Hardness: 2 to 3
Streak: White
Colour: White, grey, violet, light green, pinkish
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).

Common impurities: Ti,Fe,Mn,Mg,Ca,Na,H2O

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