REDDLE, Raddle, or Ruddle, a species of marle, found in various parts of Britain, particularly in the counties of Stafford and Derby.
This mineral is of a deep-red colour; and, on being handled, stains the fingers. It consists of clay and oxyd of iron; falls to powder in water; and, when heated in the fire, becomes black.
Reddle is used in the manufacture of colours; in the marking of sheep; and, we understand, has lately been employed in Staffordshire, with great advantage, as a manure.