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Masutomilite

#PD34814
SOLD
Masutomilite from Hirukawa, Gifu Pref., Chubu, Honshu Island, Japan - PD34814
Masutomilite from Hirukawa, Gifu Pref., Chubu, Honshu Island, Japan - PD34814

Masutomilite

#PD34814
Availability
Sold
Size
3 x 2.5 x 0.1 cm - Thumbnail 
Formula
KLiAlMn2+(Si3Al)O10(F,OH)2 (RRUFF)
Locality
Hirukawa, Gifu Pref., Chubu, Honshu Island, Japan

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal. Contains Li, Al, Mn2+ in the (M) octahedral sites with F>OH in the (A) position. Mindat places K & Rb in the Interlayer sites.

Rare worldwide with only in two in the USA, originally described from Japan. According to Bernard & Hyrsl, occurs in Na-Li rich pegmatites in Czech Republic, and Japan and is typically purple to pink.

This is a small cleavage plate.

Masutomilite

Formula
KLiAlMn2+(Si3Al)O10(F,OH)2 
Crystal System
Monoclinic 
Crystal Habit
Pseudo Hexagonal 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
purple pink 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
2.5 

Data courtesy of Webmineral.

Collection
Phillips Collection

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