Historical reference: Do not rely on this information. It is very old. About this collection
Iron-stone, a general name for a number of ires of iron containing the oxides or carbonates, >ften with an admixture of sand, clay, limestone, ir organic matter. They include the various more >r less impure forms of haematite, limonite, siderite, day-ironstone, and magnetite, which are here lescribed under those separate headings.