gemstone
Pearl
Calcium Carbonate (Aragonite/Calcite) - CaCO3
AI-generated identification · may be incorrectHardness of 2.5-4.5 on the Mohs scale, white to iridescent color, pearly luster, and composed of concentric layers of crystalline and organic matrix.
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Physical properties
Hardness of 2.5-4.5 on the Mohs scale, white to iridescent color, pearly luster, and composed of concentric layers of crystalline and organic matrix.
Formation & geological history
Formed organically within the soft tissue of living shelled mollusks as a defense mechanism against irritants.
Uses & applications
Widely used in fine jewelry such as necklaces, rings, and earrings.
Geological facts
Unlike most gemstones derived from minerals and rocks, pearls are entirely biological in origin.
Field identification & locations
Identified by its distinctive warm touch, organic luster, and effervescence when exposed to mild acid.
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Pearl necklace
Pearl, primarily aragonite (CaCO₃) and conchiolin
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