Which mineral is classified as an ore of calcium?

Dolomite is classified as an ore of calcium because it contains both calcium and magnesium carbonate (CaMg(CO3)2). This mineral is significant for its dual content, allowing it to be a source of calcium when processed. In addition to being an important material for various industrial applications, dolomite contributes to the production of cement and has agricultural uses as a soil conditioner.

In contrast, while gypsum, calcite, and limestone contain calcium, they do not serve as suitable ores for extracting calcium in the same context as dolomite. Gypsum is primarily a calcium sulfate mineral, which does not provide calcium in its carbonate form. Calcite and limestone are more straightforward sources of calcium carbonate (CaCO3), which are important for various purposes but are not specifically classified as ores for calcium in the same way dolomite can be.