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Lepidolite with Muscovite

#43759

Lepidolite with Muscovite

#43759
Availability
Sold
Size
9.5 x 4 x 1 cm - Cabinet 
Formula
K(Li,Al)3(Si,Al)4O10(F,OH)2 (RRUFF)
Locality
Itinga, Minas Gerais, Brazil

White Muscovite rimmed by purple Lepidolite.

Lepidolite is a lithium rich mica falling within the solid solution of polylithionite - trilithionite. According to Dr. David London, the lilac or purple color is not due to the presence of lithium but due to the presence of minor manganese. Lepidolite is found chiefly in pegmaties but not exclusive to pegmatites.

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.

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