One of the mysteries of the English language finally explained.
Haematite occurring in rounded, kidney-shaped masses.
- ‘Hematite specimens occurring as ‘kidney ore’ were found to some degree in most of the area's mines.’
- ‘Typically the Furness haematite is found in rounded masses, resembling animal kidneys, and so is known as kidney ore.’
- ‘It produced a large number of fine specimens of grape ore and kidney ore.’
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