[Pronounced: oak-er] Naturally-occurring mineral – goethite or haematite or limonite – which was (possibly mixed with clay) and used in cave art and as a body decoration by Palaeolithic people, as at Paviland (South Wales) It has been suggested that the material was used for its medicinal and other properties, and its resemblance to blood may have been significant
a moderate yellow-orange to orange color any of various earths containing silica and alumina and ferric oxide; used as a pigment of a moderate orange-yellow color