Multiple choice What is named as Carnallite? Na2B4O7.10H2O CaCO3.MgCO3 KCl MgCl2. 6H2O Na3 AlF6 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Carnallite is a naturally occurring mineral with the chemical formula KCl·MgCl₂·6H₂O. It is an important source of potassium and magnesium. Option A is borax, B is dolomite, and D is cryolite.