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Polylithionite crystals - click for larger pic
Polylithionite crystals
Photo by Violet Anderson
© Royal Ontario Museum

Polylithionite crystals - click for larger pic
Polylithionite crystals
© Doug Merson

Polylithionite crystals - click for larger pic
Polylithionite crystals
© Gilles Haineault

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Home > Mineral Descriptions > Polylithionite - (6 Photos)



Polylithionite
KLi2AlSi4O10(F,OH)2

     Polylithionite occurs at Mont Saint-Hilaire as superb pseudo- hexagonal crystals forming very attractive rosettes. Tainiolite is another closely related mica-group species ressembling polylithionite, however it does not fluoresce.

PHYSICAL CHARACTERISTICS:

Color varies from colorless to silvery; and in larger crystals from
   pale brown to pale yellow-brown.
Luster is pearly.
Diaphaneity is transparent to translucent or opaque for the larger
   crystals.
Crystal System is monoclinic; C2/m.
Crystal Habits include pseudohexagonal books, very thin and
   fairly loose lamellae.
Cleavage {001} is perfect.
Fracture is not apparent due to cleavage.
Hardness varies from 2 to 3
Specific Gravity is approximately 2.8g/cm3
Streak is white.
Associated Minerals include many minerals.
Distinguishing Features: Bright lemon-yellow fluorescence under SW,
   crystal habits.
Origin: Named in 1884 from the Greek polys, much, and lithium for its
   high lithium content.

CLASSIFICATION:

Dana System
# 71.2.2b.8

Strunz Classification
# VIII/H.12-50

REFERENCES:
MinRec 21:330 (1990), Dana 8:1464 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
¤¤

AP
¤¤

MX
¤¤

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

Legend

Polylithionite crystals - click for larger pic
Polylithionite crystals
© Doug Merson

Polylithionite crystals - click for larger pic
Polylithionite crystals
© Stephan Wolfsried

Polylithionite crystals - click for larger pic
Polylithionite crystals
© Stephan Wolfsried