Manganite is a manganese- containing mineral . Chemical formula MnO (OH) ( manganese metahydroxide ). Important manganese ore . Columnar crystals , roughly shaded along, often in the druses . Also observed in dense, earthy and flowing forms. SiO 2 , Fe 2 O 3 impurities, etc.
| Manganite | |
|---|---|
 | |
| Formula | MnO (OH) |
| Impurity | SiO 2 , Fe 2 O 3 |
| Physical properties | |
| Colour | Black gray |
| Color features | Brown |
| Shine | Metallike |
| Transparency | Opaque |
| Hardness | four |
| Cleavage | Committed to {010}, imperfect to {110} and {001} |
| Density | 4.3 - 4.4 g / cm³ |
| Syngony | Monoclinic |
Content
Properties
Monoclinic Habitus prismatic. Doubles for {011} and {100}. Cleft perfect over {010}, imperfect over {110} and {001}. Black colour. The feature is brown. Metallic glitter. Mohs hardness 4. Specific gravity 4.3.
Origin
Low - temperature hydrothermal - found in the veins with barite , calcite , siderite . Sedimentary - in manganese deposits , together with pyrolusite . In low-temperature hydrothermal deposits it is found in association with barite , siderite , braunite, and other minerals. Occurs in residual clays , sometimes in deposits of hot springs.
See also
- Manganites
Literature
- Mineralogy and Petrography ,. - M .: State Scientific and Technical Publishing House of Literature on Geology and Subsoil Protection, 1958. - P. 151-152.
- Geological dictionary, T. 1. - M .: Nedra, 1978. - P. 411.