the Latin word Marmar which itself comes from the Greek root Marmarous meaning thereby a shining stone.Marble is a metamorphic rock resulting from the re-crystallization of limestone softened from heat and pressure.Main constituents are calcium and dolomite. Hardness ranges from 2.5 to 5 on the MOH scale derived from the Latin word Marmar which itself comes from the Greek root Marmarous meaning thereby a shining.