Natural mineral (3)

I believe the answer is:

ore

'natural mineral' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ore that I've seen before include "it could be gold" , "Small coins" , "Mineral deposit" , "Material for smelting" , "Mineral - Scandinavian monetary unit" .)

I've seen this clue in the Penny Press and The Star Tribune.

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