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Alluaudite

#41597

Alluaudite

#41597
Availability
Sold
Size
7 x 5 x 3.5 cm - Sm Cabinet 
Formula
(Na,Ca)2(Mn,Mg,Fe2+)(Fe3+,Mn2+)2(PO4)3 (RRUFF)
Locality
Townsite mine, Custer Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

Solid dark green granular mass. This is a tightly packed mass which is very hard to break. Paul Moore classifies this mineral as an metasomatic product of parent Triphylite with the addition of Na and Ca. 

XRD Confirmed, Raman

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.

Special Info
XRD Confirmed
Special Info
Raman

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