GK QUESTION#3533
Which historical name was used for secondary zinc ores containing zinc carbonate and hydrous zinc silicate?
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Answer
C. Calamine
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Explanation
Calamine is a historical name for secondary zinc ores, especially smithsonite, zinc carbonate, and hemimorphite, a hydrous zinc silicate, which can occur together. It is not a single well-defined modern mineral species. The historical ore term is also distinct from modern calamine-lotion formulations.