| Only the manganous and the chromic salts, however, are of importance. |
| Formed by adding potassium hydrate to manganous sulphate, and filtering and drying the precipitate in vacuo. |
| With oxygen it probably forms manganous oxide, which is less harmful than ferrous oxide. |
| It is produced by igniting manganous carbonate, or manganic oxide, or manganic peroxide. |
| By precipitating a solution of manganous sulphate with a solution of sodium phosphate. |
| In barytobiotite and manganophyllite the magnesia is partly replaced by baryta and manganous oxide respectively. |
