The beautiful crystallised mineral called chrysolite is a silicate of magnesium, coloured with ferrous oxide.
Fig. 121 shows us, also, what are the conditions under which the reduction of ferric to ferrous oxide by carbon can occur.
With oxygen it probably forms manganous oxide, which is less harmful than ferrous oxide.
ferrous oxide is obtained when ferric oxide is reduced in hydrogen at 300 as a black pyrophoric powder.
A little more, and I won't know whether I'm a nitrous sulphide or a ferrous oxide of bromo seltzer.
Oxygen, probably dissolved in the iron as ferrous oxide FeO, also makes the metal red-short.
The iron found is multiplied by 1.286, and reported as ferrous oxide.
The minerals augite and hornblende are double salts of silicic acid, magnesium, and calcium with some ferrous oxide.
On weathering, magnetite commonly passes into limonite, the ferrous oxide having probably been removed by carbonated waters.
In a reducing atmosphere, on the contrary, ferrous oxide readily forms and attacks the clay, forming a dark grey vitreous mass.
|ferrous oxide |
A black powder used to make steel, green heat-absorbing glass, and enamels. Chemical formula: FeO.