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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
- WebMineral
- View Polylithionite
- Mindat
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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.
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.