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