gemstone
Pearl
Calcium Carbonate (Aragonite/Calcite) and Conchiolin
AI-generated identification · may be incorrectHardness 2.5-4.5 on Mohs scale, white or iridescent color, pearlescent luster, and amorphous or microcrystalline structure.
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Physical properties
Hardness 2.5-4.5 on Mohs scale, white or iridescent color, pearlescent luster, and amorphous or microcrystalline structure.
Formation & geological history
Formed organically inside the mantle of living saltwater or freshwater mollusks as a defense against irritants.
Uses & applications
Widely used in fine jewelry, necklaces, earrings, and decorative art objects.
Geological facts
Unlike mined gems, pearls are entirely biological in origin and require no cutting or polishing to reveal their luster.
Field identification & locations
Identified by its characteristic organic luster and slight grit when rubbed against teeth; harvested globally from pearl farms.
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