Manganosite
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| Manganosite | |
|---|---|
| General | |
| Category | Oxide mineral |
| Chemical formula | Manganese oxide, MnO |
| Strunz classification | 04.AB.25 |
| Identification | |
| Color | Emerald-green, becoming black on exposure to air |
| Crystal habit | Granular to massive: Crystals rare |
| Crystal system | Cubic |
| Cleavage | Perfect on [100], [010] and [001] |
| Fracture | Fibrous |
| Mohs scale hardness | 5 - 6 |
| Luster | Vitreous, adamantine to dull |
| Streak | Brown |
| Diaphaneity | Transparent to translucent to opaque |
| Specific gravity | 5.18 |
| Optical properties | Isotropic |
| References | [1][2][3] |
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.[2] 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.[3]
It occurs in manganese nodules. It also occurs as alteration of manganese minerals such as rhodocrosite during low oxygen metamorphism and metasomatism[3]
[edit] References
- ^ http://webmineral.com/data/Manganosite.shtml Webmineral data
- ^ a b http://www.mindat.org/min-2503.html Mindat
- ^ a b c http://www.handbookofmineralogy.org/pdfs/manganosite.pdf Handbook of Mineralogy
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