Phyllosilicate (sheet silicate), mica group, forms a series with trilithionite and with siderophyllite.
Specific gravity: 2.58 to 2.82
Hardness: 2 to 3
Colour: White, grey, violet, light green, pinkish
Common impurities: Ti,Fe,Mn,Mg,Ca,Na,H2O
Polylithionite occurs in syenite pegmatites in alkaline rocks
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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