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Lepidolite transitional member

#PD34676

Lepidolite transitional member

#PD34676
Availability
Sold
Size
5 x 4 x 2.5 cm - Miniature 
Formula
K(Li,Al)3(Si,Al)4O10(F,OH)2 (RRUFF)
Locality
Zambezia prov., Mozambique

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahdera. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Lepidolite falls on or close to the Trilithionite - Polylithionite join and is a light mica with substantial lithium.  Contain fluorine in the (A) position.

Can be easily distinguished from rgular mica by the flame test for lithium.

Found in complex zoned pegmatites.  Potassium is often replaced by Na, Rb, and Cs.

This specimen is all Lepidolite, with compact elongated pink crystals.

Lepidolite

Formula
K(Li,Al)3(Si,Al)4O10(F,OH)2 
Crystal System
Monoclinic 
Crystal Habit
Platy, Foliated, Massive 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
colorless, gray white, lilac, yellowish, white 
Streak
white 
Class
Monoclinic 
Fracture
Uneven 
Hardness
2.5-3 

Data courtesy of Webmineral.

Collection
Phillips Collection

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