Yes, calcium is a mineral. As stated at the bottom of your Heavy Metals results page: "Please note these Heavy Metals are not to be confused with minerals."
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Calcium as seen on your heavy metals section is in fact "calcium chloride" which is a derivative of calcium and an inorganic compound. Not to be confused with Calcium as the mineral found in dairy products. Calcium chloride is commonly found in: laundry detergents, stain removers, fabric softeners, dishwasher detergents, ice melts, moisture absorbers, deodorants, facial serums, toilet bowl cleaners, fish tank and aquarium supplements.