Micaceous iron ore consists of delicate steel-grey scales of specular haematite, unctuous to the touch, used as a lubricant and also as a pigment.
A soft, unctuous form results on treating carbon with ash or silica in special furnaces, and this gives the so-called "deflocculated" variety when treated with gallotannic acid.
For garden purposes loam should be rather unctuous or soapy to the touch when moderately dry, not too clinging nor adhesive, and should readily crumble when a compressed handful is thrown on the ground.
Langlois, "is learned, unctuous, ornate, florid, a mysticism which never indulges in dangerous temerities; it is the orthodox mysticism of a subtle and prudent rhetorician."
The skin is unctuous and of a deep-toned yellow colour.