ferrous oxide
Noun
Meaning
ferrous oxide (uncountable)
English Wikipedia has an article on:ferrous oxideWikipedia
(chemistry) The chemical compound FeO, iron oxide where iron has a valence of +2.
Examples
For such iron-rich rocks to be deposited there would have to be anoxia in the ocean, so that much dissolved iron (as ferrous oxide ) could accumulate before it met an oxidant that would precipitate it as ferric oxide.
It helps to have the iron oxide as ferrous oxide (FeO) which is obtained via slight reducing conditions i.e. operating with zero excess oxygen at the kiln exit.
The conversion of the passivating ferrous oxide layer to rust results from the combined action of two agents, usually oxygen and water.