Janggunite
A variety of Minerals
What is Janggunite?
Janggunite is a rare manganese oxide mineral with the chemical formula Mn5-x(Mn,Fe)1+xO8(OH)6. It was first described in 1975 for an occurrence in the Janggun mine, Bonghwa-gun, Gyeongsangbuk-do, South Korea and named for the locality.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Janggunite 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
- black
- Hardness (Mohs)
- 2 - 3
- Rock tumbling
- Not recommended
- Density
- 3.58 g/cm³
- Streak
- brownish black to dark brown
Chemical Properties
- Chemical Formula
- Mn5-x(Mn,Fe)1+xO8(OH)6
- Elements
- Fe, H, Mn, O
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Janggunite FAQs
How do I identify Janggunite?
Janggunite can be identified by its hardness of 2 - 3 on the Mohs scale, black color. Look for these key characteristics when examining specimens.
What color is Janggunite?
Janggunite typically appears in black. Color can vary depending on impurities and formation conditions.
How hard is Janggunite?
Janggunite has a hardness of 2 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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