Ochre

A impure earthy ore of iron or a ferruginous clay, usually red (hematite) or yellow (limonite), -- used as a pigment in making paints, etc. The name is also applied to clays of other colors.

A metallic oxide occurring in earthy form; as, tungstic ocher or tungstite.

See Ocher.

any of various earths containing silica and alumina and ferric oxide; used as a pigment