Marble: A recrystallized limestone that formed when the limestone softened from heat and pressure and recrystallized into marble where mineral change occurred. The main consistency is calcium and dolomite. Ranges in many colors and is usually heavily veined and shows lots of grains. Hardness rates from 2.5 to 5 on the MOH Scale. Marble is classified into three categories: 1. Dolomite: If it has more than 40% magnesium carbonates. 2. Magnesium: If it has between 5% and 40% magnesium 3. Calcite: If it has less than 5% magnesium carbonate. Marble floor medallions are easier to repolish if scratched.
