ironstone
nounUK /ˈaɪənstəʊn/
US /ˈaɪərnstoʊn/
Ironstone is a hard rock that has a lot of iron in it.
The old house was built from ironstone that had been dug from the nearby hills.
OTHER MEANINGS
2. A type of strong pottery or stoneware made to look like iron.
She served the tea in cups made of ironstone.
3. A hard, dense variety of clay used to make such pottery.
The factory imported ironstone to produce durable dinnerware.
4. A sedimentary rock cemented by iron compounds, often found in bands.
Geologists studied the ironstone layers along the cliff.