Calcium carbonate forms as both Aragonite and Calcite, and these two minerals only differ in their crystallization. Calcite, the more common mineral, forms in trigonal crystals, whereas Aragonite forms orthorhombic crystals. Metaphysical properties: Aragonite is a stabalizing stone greatly aiding in times of stress. You will receive 2 specimens randomly selected total weight between 20 and 30 g. They will be approximatly 1in. in size.