Althausite
A variety of Minerals
What is Althausite?
Althausite is a relatively simple magnesium phosphate mineral with formula Mg2(PO4)(OH,F). It is very rare. Original occurrences are magnesite deposits among serpentinites. It is named after Egon Althaus (born 1933), a mineralogist at the University of Karlsruhe, Germany.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Althausite 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
- Pale gray, reddish brown; dark blue, green, black
- Hardness (Mohs)
- 3.5 - 4
- Rock tumbling
- Not recommended
- Density
- 2.91 g/cm³
Chemical Properties
- Chemical Formula
- Mg4(PO4)2(OH,O)(F,☐)
- Elements
- F, H, Mg, O, P
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Althausite FAQs
How do I identify Althausite?
Althausite can be identified by its hardness of 3.5 - 4 on the Mohs scale, Pale gray color. Look for these key characteristics when examining specimens.
What color is Althausite?
Althausite typically appears in Pale gray, reddish brown; dark blue, green, black. Color can vary depending on impurities and formation conditions.
How hard is Althausite?
Althausite has a hardness of 3.5 - 4 on the Mohs scale. This gives it moderate hardness.
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