Clay ironstone

Also found in: Encyclopedia.
an ore of iron consisting of the oxide or carbonate of iron mixed with clay or sand.
See under Clay.

See also: Clay, Ironstone

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The ore is clay ironstone consisting of carbonate of iron with clay, calcium, magnesium carbonates and phosphorus.