Alleghanyite
A variety of Minerals
What is Alleghanyite?
Alleghanyite is a moderately rare humite mineral with formula Mn5(SiO4)2(OH)2, belonging to the nesosilicates class. In general its occurrences are related with metamorphic (metamorphosed) manganese deposits. The mineral is named after Alleghany County, North Carolina, US.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Alleghanyite 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.
Alleghanyite Localities Map
See where Alleghanyite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Pinkish to reddish brown, deep pink, grayish pink
- Hardness (Mohs)
- 5.5
- Density
- 3.96 g/cm³
- Streak
- Very pale pink
Chemical Properties
- Chemical Formula
- Mn2+5(SiO4)2(OH)2
- Elements
- H, Mn, O, Si
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Alleghanyite FAQs
How do I identify Alleghanyite?
Alleghanyite can be identified by its hardness of 5.5 on the Mohs scale, Pinkish to reddish brown color. Look for these key characteristics when examining specimens.
What color is Alleghanyite?
Alleghanyite typically appears in Pinkish to reddish brown, deep pink, grayish pink. Color can vary depending on impurities and formation conditions.
How hard is Alleghanyite?
Alleghanyite has a hardness of 5.5 on the Mohs scale. This gives it moderate hardness.
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