Aldermanite

A variety of Minerals

What is Aldermanite?

Aldermanite is a rare hydrated phosphate mineral with formula Mg5Al12(PO4)8(OH)22·32H2O. It's named after Arthur Richard Alderman (1901–1980), Professor of Geology and Mineralogy, University of Adelaide. Its type locality is Moculta Phosphate Quarry (Klemm's Quarry), Angaston, Barossa Valley, North Mount Lofty Ranges, Mount Lofty Ranges, South Australia, Australia.

Market Value Factors

Pricing varies for every rock and mineral, so use these universal factors to gauge Aldermanite 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.

Applies to all rocks & minerals.

Quick Facts

Physical Properties

Color: Colorless in transmitted light
Hardness (Mohs): 2
Rock tumbling: Not recommended
Density: 2.1 g/cm³
Streak: White

Chemical Properties

Chemical Formula: Mg₅Al₁₂(PO₄)₈(OH)₂₂ · 32H₂O
Elements: Al, H, Mg, O, P

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Aldermanite FAQs

How do I identify Aldermanite?

Aldermanite can be identified by its hardness of 2 on the Mohs scale, Colorless in transmitted light color. Look for these key characteristics when examining specimens.

What color is Aldermanite?

Aldermanite typically appears in Colorless in transmitted light. Color can vary depending on impurities and formation conditions.

How hard is Aldermanite?

Aldermanite has a hardness of 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.