How do I identify Alluaudite?

Alluaudite can be identified by its hardness of 5.5 - 6 on the Mohs scale, Dirty yellow to brownish yellow color. Look for these key characteristics when examining specimens.

What color is Alluaudite?

Alluaudite typically appears in Dirty yellow to brownish yellow, grayish green; surficially dull greenish black, brownish black, black, when altered. Color can vary depending on impurities and formation conditions.

How hard is Alluaudite?

Alluaudite has a hardness of 5.5 - 6 on the Mohs scale. This gives it moderate hardness.

Alluaudite

A variety of Minerals

What is Alluaudite?

Alluaudite is a relatively common alkaline manganese iron phosphate mineral with formula (Na,Ca)Mn(Fe,Mn,Fe,Mg)2(PO4)3. It occurs as metasomatic replacement in granitic pegmatites and within phosphatic nodules in shales. It was first described in 1848 for an occurrence in Skellefteå, Västerbotten, Sweden. It was named by Alexis Damour after François Alluaud (II) (1778–1866).

Alluaudite Market Value Calculator

Estimate the market value of Alluaudite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Alluaudite Localities Map

See where Alluaudite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

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North ZoneCentral RidgeSouth Basin

Quick Facts

Physical Properties

Color: Dirty yellow to brownish yellow, grayish green; surficially dull greenish black, brownish black, black, when altered
Hardness (Mohs): 5.5 - 6
Density: 3.4 - 3.5 g/cm³
Streak: Brownish yellow