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Mineralpedia Details for Polylithionite

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Polylithionite

Polylithionite

Phyllosilicate - Monoclinic - Mica group member. End member. Ordinary (True or Common) Mica - Trioctahderal with lithium and aluminum in the (M) positions, Si and boron in the (T) positions, F>OH in the (A) position and K as the Interlayer cation.

Occurs as tabular crystals with hexagonal outline, also scaly, fine grained, white, gray, pale green, pale pink and violet. Can be fluorescent green. Typically found in alkaline syenites and their pegmatites including MSH and Ilimaussaq.

Formula
KLi2AlSi4O10F2 
Crystal System
Monoclinic 
Crystal Habit
Pseudo Hexagonal, Tabular, Scaly 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
bluish, colorless, violet, greenish, pearl white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
2-3 
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Polylithionite from Ilimaussaq complex, Narsaq, Kitaa prov., Greenland

Polylithionite
            from Ilimaussaq complex, Narsaq, Kitaa prov., Greenland

Phyllosilicate - Monoclinic - Mica group member. End member. Ordinary (True or Common) Mica - Trioctahderal with lithium and aluminum in the (M) positions, Si and boron in the (T) positions, F>OH in the (A) position and K as the Interlayer cation.

Occurs as tabular crystals with hexagonal outline, also scaly, fine grained, white, gray, pale green, pale pink and violet. Can be fluorescent green. Typically found in alkaline syenites and their pegmatites including MSH and Ilimaussaq.

This is a larger specimen with Aegerine and a Copenhagen label.

Click thumbnail images for larger view.

Polylithionite from Lepkhe-Nel'm Mt, Seidozero Lake, Lovozero Massif, Kola Peninsula, Russia

Polylithionite
            from Lepkhe-Nel'm Mt, Seidozero Lake, Lovozero Massif, Kola Peninsula, Russia

Phyllosilicate - Monoclinic - Mica group member. End member. Ordinary (True or Common) Mica - Trioctahderal with lithium and aluminum in the (M) positions, Si and boron in the (T) positions, F>OH in the (A) position and K as the Interlayer cation.

Occurs as tabular crystals with hexagonal outline, also scaly, fine grained, white, gray, pale green, pale pink and violet. Can be fluorescent green. Typically found in alkaline syenites and their pegmatites including MSH and Ilimaussaq.

A nice specimen with colorless plates of Tainiolite.

Click thumbnail images for larger view.

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