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**Chemical formula:** CaCO₃ **Hardness:** 3.5‒4 **Density:** 2.9 g/cm³ **Crystal system:** Orthorhombic **Luster:** Vitreous, resinous **Description:** Aragonite is one of the two crystalline forms of calcium carbonate (CaCO₃), often forming columnar or fibrous crystals. Its typical colors include white, gray, bluish-white, and yellowish-white. The type location for aragonite is Molina de Aragón in Spain. Aragonite occurs naturally in almost all mollusk shells, calcareous worms, some corals, and extinct ammonites. ## Keywords mineral Aragonite texture color ornamental stone semi-precious gemstone
