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:
Polylithionite occurs in syenite
pegmatites in alkaline rocks
(Webmin).
Localities
At Minas Gerais, Brazil, polylithionite pseudomorphs after
tourmaline have been found
(KL p237).
At Mont Saint Hilaire, Quebec, Canada, polylithionite occurs with
tainiolite in
pegmatites and rarely in
marble
xenoliths (Dana).
Polylithionite from Mont Saint-Hilaire -
Image
At the type locality, the Kangerluarsuk Fjord, Ilímaussaq complex, Greenland, Denmark, polylithionite
occurs in a syenite
pegmatite
(Dana).
Polylithionite from the Kangerluarsuk Fjord -
Image
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).
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