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Minerals are grouped into mineral classes primarily on a basis of _____. the number of cleavage directions present chemistry, specifically the cations within the chemical formula chemistry, specifically the anions within the chemical formula hardness; hard, soft, and medium are the three primary classes

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I think minerals are grouped into mineral classes primarily on a basis of specifically the anions within the chemical formula. Anions are the negatively charged ions in a mineral. These anions are larger than cations and are mostly attracted to positive ions.

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