Jacobsite
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| Jacobsite | |
|---|---|
| Category | Mineral |
| Chemical formula | iron(II,III) manganese oxide, MnFe2O4 |
| Identification | |
| Color | Black |
| Crystal habit | Disseminated to massive |
| Crystal system | Isometric Hexoctahedral |
| Cleavage | none |
| Fracture | Conchoidal |
| Mohs Scale hardness | 5.5 - 6.0 |
| Luster | Metallic |
| Refractive index | Opaque |
| Streak | reddish black |
| Specific gravity | 4.75 |
Jacobsite is a manganese iron oxide mineral. It is a magnetite spinel.
It was first described in 1869 and named for the location of Jakobsberg, Sweden.
[edit] References
- Mindat with location data
- National Pollutant Inventory - Manganese and compounds Fact Sheet
- Webmineral.com article
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