Minerals identify

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Alluaudite

Phosphate mineral

Alluaudite is a relatively common alkaline iron with formula (Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3. It occurs as metasomatic replacement in granitic pegmatites and within phosphatic nodules

It was first described in 1848 for an occurrence in Skellefteå , Västerbotten. It was named by Alexis Damour (II) (1778–1866).

Identification

Color of mineral

Brown
Yellow
Grey
Green
Black
Red

Mohs scale ( mineral hardness )

5

The streak

Yellow

Density ( specific gravity )

1.782
1.802
1.835

Crystal ( diaphaneity )

Monoclinic