Manganosite
A variety of Minerals
What is Manganosite?
Manganosite is a rare mineral composed of manganese(II) oxide MnO. It was first described in 1817 for an occurrence in the Harz Mountains, Saxony-Anhalt, Germany. It has also been reported from Langban and Nordmark, Sweden and at Franklin Furnace, New Jersey. It also occurs in Japan, Kyrgyzstan and Burkina Faso. It occurs in manganese nodules. It also occurs as alteration of manganese minerals such as rhodocrosite during low oxygen metamorphism and metasomatism.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Manganosite 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.
Manganosite Localities Map
See where Manganosite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Emerald-green, darkening on exposure to black
- Hardness (Mohs)
- 5.5
- Density
- 5.36 g/cm³
- Streak
- Brown
Chemical Properties
- Chemical Formula
- MnO
- Elements
- Mn, O
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Manganosite FAQs
How do I identify Manganosite?
Manganosite can be identified by its hardness of 5.5 on the Mohs scale, Emerald-green color. Look for these key characteristics when examining specimens.
What color is Manganosite?
Manganosite typically appears in Emerald-green, darkening on exposure to black. Color can vary depending on impurities and formation conditions.
How hard is Manganosite?
Manganosite has a hardness of 5.5 on the Mohs scale. This gives it moderate hardness.
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