Chemical and electron microprobe analyses of copper-bearing alteration products of scheelite from the Copiapó mining district indicate that, although cuprotungstite, sensu stricto, occurs in minor amounts, the greater proportion of the replacive phase is a calcium-copper tungstate, with a highly variable composition which does not necessarily conform to the general formula, xCaWO4·yCu2WO4(OH)2. It is recommended that the term “cuproscheelite” be retained as a field description for such assemblages.

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