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Mineralpedia Details for Alluaudite

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Alluaudite

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 
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Alluaudite from Pleasant Valley mine, Custer Co., South Dakota, United States

Alluaudite
            from Pleasant Valley mine, Custer Co., South Dakota, United States
Special Info
XRD Confirmed

Dark green crystalline or granular and noduler Alluaudite, a primary phosphate. Confirmed by XRD.

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