The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 3 as “calcite”. Other polymorphs of calcium carbonate are the minerals aragonite and vaterite. Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 °C. Calcite has the power to act energetically on all chakras, helping us to strengthen our immune system and also guaranteeing a good energy cleansing. This mineral is of common occurrence, and can be found in several places on earth. It helps us to have greater emotional stability and it is effective in treating physical fatigue.