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ironstone's Usage Examples:

stone were used in construction, including ironstone which was used for galleting.

OperationMineral resources near the top end of the canal included ironstone, which was normally extracted by scouring.

The three hills are formed of an ironstone known.

typical ironstone or haematite opencasts.

(laterite); and ooidal ironstone.

ironstone random rubble, partly rendered, with freestone dressings and ashlar, brick and tile buttresses.

Molybdenum may be strongly sorbed in ironstone soils.

These are magnetite, titanomagnetite, massive hematite and pisolitic ironstone deposits.

ironstone concretions, formed approximately 309 million years ago in the mid-Pennsylvanian epoch of the Carboniferous period.

The ironstone concretions are recovered from exposures along streams, roadcuts and in active or abandoned coal mine areas.

formerly used to burn ironstone to remove impurities, leaving a layer of calcine, which produces poor soil in which wildflowers flourish.

The fossils are preserved in ironstone concretions, formed approximately in the mid-Pennsylvanian epoch of the Carboniferous period.

various forms of ironstone include siderite nodules; deeply weathered saprolite, i.