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).
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Alluaudite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
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
- Rock tumbling
- With care
- Density
- 3.4 - 3.5 g/cm³
- Streak
- Brownish yellow
Chemical Properties
- Chemical Formula
- (Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
Also Known As
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Alluaudite FAQs
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.
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