ironstone

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ironstone

a natural ore which may contain significant amounts of fluorine and cause fluorosis in cattle grazing pastures in the vicinity of a factory which calcines the ore.
References in periodicals archive ?
These patterns suggest that the genesis of magnetic minerals in ironstones can be favoured by relatively coarse soil matrices, perhaps because they allow for faster oxygenation or higher temperatures during burning.
However, the occurrence of ironstones in soils developed from Fe-poor sedimentary rocks or in soils poor in Fe-oxides has been reported in the Brazilian Cerrado (Coelho et al.
Although the impregnation of these platy and quartzite gravels by Fe, Mn and Al oxides can lead to their misnaming as ironstones and to erroneous interpretation of soil-formation processes, they can be macroscopically identified correctly by the platy shape or mostly white core (quartzite gravels).
The magnetic and non-magnetic black nodules, as well as the red earthy gravels, had mineralogical and morphological features that fit conventional concepts of ironstone or petroplinthite as products of pedogenesis.
Mika joined Ironstone in 2013 after working in investment banking at Stifel Nicolaus Canada Inc.
Ironstone Resources focuses on identifying undeveloped resource assets, and enhancing their value through application of geological and process expertise to deliver value to its shareholders and partners.
Ironstone takes a long term and responsible approach to building its business by concentrating on the development of large, long-life metallic deposits.