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Masutomilite

#46464
SOLD
Masutomilite from Mokrusha pegmatite, Alabashka peg. field, Murzinka dist., Middle Urals, Russia - 46464
Masutomilite from Mokrusha pegmatite, Alabashka peg. field, Murzinka dist., Middle Urals, Russia - 46464

Masutomilite

#46464
Availability
Sold
Size
6 x 4 x 2 cm - Sm Cabinet 
Formula
KLiAlMn2+(Si3Al)O10(F,OH)2 (RRUFF)
Locality
Mokrusha pegmatite, Alabashka peg. field, Murzinka dist., Middle Urals, Russia

A purplish cleavable mass. The specimen was positively identified by Dr. Igor Pekov.

Masutomilite is a mica group member and an 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.

XRD Confirmed, EDS Confirmed

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.

Special Info
XRD Confirmed
Special Info
EDS Confirmed
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