Apjohnite
A variety of Minerals
What is Apjohnite?
Apjohnite is a manganese aluminum sulfate mineral with the chemical formula MnAl2(SO4)4·22H2O. It was named after Trinity College Dublin professor James Apjohn. Its type locality is Maputo Province, Mozambique.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Apjohnite 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
- Colourless, white, light pink, light yellow, light green.
- Hardness (Mohs)
- 1.5 - 2
- Rock tumbling
- Not recommended
- Density
- 1.78 g/cm³
Chemical Properties
- Chemical Formula
- Mn2+Al2(SO4)4 · 22H2O
- Elements
- Al, H, Mn, O, S
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Apjohnite FAQs
How do I identify Apjohnite?
Apjohnite can be identified by its hardness of 1.5 - 2 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Apjohnite?
Apjohnite typically appears in Colourless, white, light pink, light yellow, light green.. Color can vary depending on impurities and formation conditions.
How hard is Apjohnite?
Apjohnite has a hardness of 1.5 - 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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