#pearls
- Aragonite — A mineral from the natural carbonate class, representing an unstable crystalline form of calcium carbonate and a high-pressure polymorph of calcite. It crystallizes in the orthorhombic system, frequently forming long prismatic crystals, acicular aggregates, or specific encrustations such as flos ferri, and constitutes the primary mineral component making up the nacre of mollusk shells and fine pearls.