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Polylithionite with Aegerine

#PD34811

Polylithionite with Aegerine

#PD34811
Availability
Sold
Size
8 x 5.5 x 2.5 cm - Sm Cabinet 
Formula
K(Li, Al)2[(F, OH)2|(Si, B)4O12 (RRUFF)
Locality
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

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 

Data courtesy of Webmineral.

Collection
Phillips Collection

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