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Dolomite is both a mineral and a rock. Dolomite is a calcium-magnesium carbonate. It is very similar to calcite and limestone in its chemical make up. Dolomite is white or light pink in color. It has a hardness of 3.5 - 4 and only will react to acid when it is heated or in powdered form. Dolomite is used as a building stone and as a source of magnesium.
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