Brownite is a mineral of Mn 2 O 3 · MnSiO 3 . Used in the metallurgical, chemical industry, for the production of manganese .
| Brownite | |
|---|---|
 | |
| Formula | Mn 2+ Mn 3+ 6 SiO 12 |
| Impurity | Fe , Ca , B , Ba , Ti , Al , Mg |
| Physical properties | |
| Color | Dark gray brown |
| Trait color | Brown gray black |
| Shine | Metal-like |
| Transparency | Opaque |
| Hardness | 6 - 6.5 |
| Cleavage | Perfect in {111} |
| Kink | Uneven |
| Density | 4.72 - 4.82 g / cm³ |
| Syngonia | Tetragonal (planaxial) |
The mineral is named after William von Braun (1790 - 1872).
Literature
- Levinson-Lessing F. Yu. Braunit // Brockhaus and Efron Encyclopedic Dictionary : in 86 volumes (82 volumes and 4 additional). - SPb. , 1890-1907.