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Macfallite with Braunite

#55640

Macfallite with Braunite

#55640
Availability
Sold
Size
4.5 x 3.5 x 3 cm - Miniature 
Formula
Ca2Mn3+3(SiO4)(Si2O7)(OH)3 (RRUFF)
Locality
Manganese mine, Copper Harbor, Keweenaw Co., Michigan

Deep rusty red radial groups of Macfallite to 7mm in black massive Braunite. This material carries a Paul Moore label from the Universitty of Chicago. Moore described Macfallite so I am assuming this stuff is type material or at least study material for the description. Macfallite is limited to only six occurences worldwide.

Type Locality

Macfallite

Formula
Ca2Mn3+3(SiO4)(Si2O7)(OH)3 
Crystal System
Monoclinic 
Crystal Habit
Acicular, Aggregates, Twinning Common 
Cleavage
Perfect, None, None 
Luster
Vitreous - Silky 
Color
brown, maroon, reddish brown, pink 
Streak
brown 
Class
Monoclinic - Prismatic 
Hardness
5-5.5 

Data courtesy of Webmineral.

Collection
Don Phillips Collection
Special Info
Type Locality

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