| Definition/Meaning | Word/Phrase |
|---|---|
| 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) | atomic number 12 , magnesium , Mg |
| very white crystalline salt that occurs naturally as magnesite or as dolomite | magnesium carbonate |
| loose and crumbling earthy deposit consisting mainly of calcite or dolomite; used as a fertilizer for soils deficient in lime | marl |