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*[http://www.webmineral.com/data/Jacobsite.shtml Webmineral.com article] |
*[http://www.webmineral.com/data/Jacobsite.shtml Webmineral.com article] |
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[[File:Jacobsite-41760.jpg|thumb|left|Jacobsite, N'Chwaning Mines, [[Kuruman]], Kalahari manganese fields, [[Northern Cape Province]], South Africa. Size 3.8 x 3.5 x 3.2 cm. [[Commons:Robert Lavinsky|Robert Lavinsky]] notes, "This specimen is the largest and richest jacobsite I have ever had to offer." ]] |
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[[Category:Oxide minerals]] |
[[Category:Oxide minerals]] |
Jacobsite | |
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General | |
Category | Mineral |
Formula (repeating unit) | iron(II,III) manganese oxide, MnFe2O4 |
Crystal system | Isometric Hexoctahedral |
Identification | |
Color | Black |
Crystal habit | Disseminated to massive |
Cleavage | none |
Fracture | Conchoidal |
Mohs scale hardness | 5.5 - 6.0 |
Luster | Metallic |
Streak | reddish black |
Specific gravity | 4.75 |
Refractive index | Opaque |
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.
This article about a specific oxide mineral is a stub. You can help Wikipedia by expanding it. |
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Borates |
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Carbonates |
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Oxides |
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Phosphates |
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Silicates |
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Sulfides |
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Other |
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