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kidney ore
noun
- geology a form of hematite that occurs in kidney-shaped masses
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Example Sentences
The reniform masses are known as kidney ore.
From Project Gutenberg
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 Project Gutenberg
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