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2 items @ $50.00  
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Alluaudite

#65800
SOLD
Alluaudite from Helen Beryl mine, Custer Co., South Dakota, United States - 65800
Alluaudite from Helen Beryl mine, Custer Co., South Dakota, United States - 65800

Alluaudite

#65800
Availability
Sold
Size
7.5 x 5 x 3 cm - Sm Cabinet 
Formula
(Na,Ca)2(Mn,Mg,Fe2+)(Fe3+,Mn2+)2(PO4)3 (RRUFF)
Locality
Helen Beryl mine, Custer Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

Dark green granular primary phosphate,

Alluaudite

Formula
(Na,Ca)2(Mn,Mg,Fe2+)(Fe3+,Mn2+)2(PO4)3 
Crystal System
Monoclinic 
Crystal Habit
Platy, Fibrous, Nodular 
Cleavage
Good, Good, None 
Color
brownish yellow, green, yellow, black 
Streak
brownish yellow 
Class
Monoclinic - Prismatic 
Hardness
5-5.5 

Data courtesy of Webmineral.

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