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Usefulness and profitability are the qualities of a mineral that classify it as an "ore".

This means that when the Geologist's who studied minerals, they classified them. It's standards in classification is meant to show elements and metals that are can profitably extracted from a rock.  

Answer;

Usefulness and profitability

The qualities of a mineral that classify it as an ore are usefulness and profitability.

Explanation;

  • Minerals refers to naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores on the other hand are concentrations of minerals in rock that are high enough to be economically extracted for use.
  • The main quality of a mineral that classifies it as an ore is its economic benefit. Each type of a mineral has a unique chemical composition and characteristics that set it apart from other minerals.

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