mineraloid
Natural White Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3
Hardness: 2.5-4.5 (Mohs scale), Color: White to silvery-cream, Luster: Pearly (orient), Crystal structure: Orthorhombic (as aragonite), Cleavage: None, Specific gravity: 2.60-2.85
- Hardness
- 2
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Physical properties
Hardness: 2.5-4.5 (Mohs scale), Color: White to silvery-cream, Luster: Pearly (orient), Crystal structure: Orthorhombic (as aragonite), Cleavage: None, Specific gravity: 2.60-2.85
Formation & geological history
Produced within the soft tissue (mantle) of a living shelled mollusk. It forms as a defense mechanism against an irritant by depositing layers of nacre. These are found in marine and freshwater environments across various geological epochs.
Uses & applications
Primarily used in fine jewelry (necklaces, earrings), cosmetics (pearl powder), and as a collector's gemstone. Historically used as a symbol of wealth and status.
Geological facts
Unlike minerals formed in the earth, pearls are organic gemstones. The unique iridescent shine, known as 'orient,' is caused by the overlapping of thin translucent layers of nacre.
Field identification & locations
Identify by its spherical or baroque shape and unique luster. Real pearls feel slightly gritty when rubbed gently against the edge of a tooth, whereas fakes feel smooth. Commonly found in tropical and subtropical coastal waters.
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