kidney ore
Britishnoun
Example Sentences
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In the Carboniferous rocks of Pennsylvania and neighbouring States to the south and west, layers of ferrous carbonate, formed when there was an excess of organic matter present, termed black-band ore and kidney ore, occur.
From North America by Russell, Israel C. (Cook)
The reniform masses are known as kidney ore.
From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" by Various
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