any iron-bearing mineral or rock with siliceous impurities.
Also called ironstone china. a hard white stoneware.

1515–25; iron + stone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ironstone (ˈaɪənˌstəʊn)
1.  any rock consisting mainly of an iron-bearing ore
2.  Also called: ironstone china a tough durable earthenware

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Yellow-brown ironstone concretions occur in this member.
They dined on white ironstone dishes with silverware and not tin plates and cups.
Tertiary ironstone conglomerate forms the caprock of low hills and ridges in this region.
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