Which one of the following materials contains calcium?
Verified Answer
A. China clay
B. Corundum
C. Gypsum
D. Talc
Explanation:
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate (CaSO₄·2H₂O). China clay (kaolin) is an aluminum silicate, corundum is aluminum oxide, and talc is a magnesium silicate.