Allactite
A variety of Minerals
What is Allactite?
Allactite is a rare arsenate mineral of metamorphosed manganese zinc ore deposits. It is found in Sweden and New Jersey, US. Its name originated from Greek αλλάκτειν (allaktein) meaning "to change", referring to the strong pleochroism of the mineral.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Allactite 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
- Brown, dark to light purplish red, brownish red, colourless to white
- Hardness (Mohs)
- 4.5
- Rock tumbling
- Not recommended
- Density
- 3.94 g/cm³
- Streak
- Grayish to faint brown
Chemical Properties
- Chemical Formula
- Mn2+7(AsO4)2(OH)8
- Elements
- As, H, Mn, O
Also Known As
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Allactite FAQs
How do I identify Allactite?
Allactite can be identified by its hardness of 4.5 on the Mohs scale, Brown color. Look for these key characteristics when examining specimens.
What color is Allactite?
Allactite typically appears in Brown, dark to light purplish red, brownish red, colourless to white. Color can vary depending on impurities and formation conditions.
How hard is Allactite?
Allactite has a hardness of 4.5 on the Mohs scale. This gives it moderate hardness.
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