magnesia
- n a white solid mineral that occurs naturally as periclase; a source of magnesium
magnesite
- n a white mineral consisting of magnesium carbonate; a source of magnesium
magnesium
- n a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine)
magnesium bicarbonate
- n a bicarbonate that is a major cause of hard water
magnesium carbonate
- n a very white crystalline salt that occurs naturally as magnesite or as dolomite