Перевод слова 'ironstone' с английского на русский

Перевод на русский слова ironstone

• noun
  • бурый железняк
  • железная руда

Английские значения слова ironstone

Ironstone is a fine-grained, heavy and compact sedimentary rock. Its main components are the carbonate or oxide of iron, clay and/or sand. It can be thought of as a concretionary form of siderite. Ironstone also contains clay, and sometimes calcite and quartz.
en.wikipedia.org/wiki/Ironstone

Any ore of iron which is impure through the admixture of silica or clay
en.wiktionary.org/wiki/ironstone

Much of Queensland s opal is found in a common ironstone boulder, which is usually a combination of aluminium oxide,silicon dioxide and ferrous oxide
www.wj.com.au/mining/glossary.html