Discussion
The mineral containing both magnesium and calcium is
Answer: D
Dolomite contains both magnesium and calcium.
Its formula is \(\mathrm{CaMg(CO_3)_2}\). Magnesite is \(\mathrm{MgCO_3}\), calcite \(\mathrm{CaCO_3}\), and carnallite \(\mathrm{KCl\cdot MgCl_2\cdot 6H_2O}\), which has magnesium but no calcium.
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