Look up: ironstone

1. ironstone
   continuous hardpan as a result of incrustation of tropical soil by ferric oxide and aluminium dehydratation Category: agriculture, fisheries, forestry - food processing industries • rock whose mineral grains are cemented by ion oxide. Category: agriculture, fisheries, forestry - food processing industries
   Found on http://www.mijnwoordenboek.nl/definition
   
   
2. Ironstone
   I'ron·stone` noun A hard, earthy ore of iron. Clay ironstone . See under Clay . -- Ironstone china , a hard white pottery, first made in England during the 18th century.
   Found on http://www.encyclo.co.uk/webster/I/96
   
   
3. Ironstone
   • (n.) A hard, earthy ore of iron.
   Found on http://thinkexist.com/dictionary/meaning
   
   
4. ironstone
   (from the article `sedimentary rock`) ...extensive, locally thick sequences composed of alternating thin (millimetre to centimetre thick) layers of mainly crystalline-textured iron-rich ...
   Found on http://www.britannica.com/eb/a-z/i/40
   
   
5. Ironstone
   Ironstone is a rock containing at least fifteen percent iron. Ironstone forms in igneous rocks through mahmatic differentiation - dense heavy minerals such as magnetite crystallise first and sink to the base of the molten magma to form an iron-rich layer. Ironstone also forms in sedimentary rocks such as limestone and sandstone.
   Found on http://www.probertencyclopaedia.com/brow
   
   
6. Ironstone
   `Ironstone` is a fine-grained, heavy and compact sedimentary rock. Its main components are the carbonate or oxide of iron, and clay or sand. It can be thought of as a concretionary form of siderite. Ironstone also contains clay, and sometimes calcite and quartz. Appearance: Freshly cleaved ironstone...
   Found on http://en.wikipedia.org/wiki/Ironstone