kidney ore
Britishnoun
Example Sentences
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The reniform masses are known as kidney ore.
From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" by Various
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)
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