mineral

Pearl (Cultured Freshwater)

Calcium Carbonate (Aragonite) - CaCO3

AI-generated identification · may be incorrect

Hardness: 2.5-4.5 (Mohs); Color: White, cream, pink, or lavender with orient iridescence; Luster: Pearly (nacreous); Crystal Structure: Orthorhombic (microcrystalline); Cleavage: None

Hardness: 2
Color: White, cream, pink, or lavender with orient iridescence
Luster: Pearly (nacreous)

Identified July 16, 2026More mineral →

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Physical properties

Hardness: 2.5-4.5 (Mohs); Color: White, cream, pink, or lavender with orient iridescence; Luster: Pearly (nacreous); Crystal Structure: Orthorhombic (microcrystalline); Cleavage: None

Formation & geological history

Formed biogenically within the soft tissue (mantle) of a living shelled mollusk. The organism secretes layers of nacre around an irritant or nucleus.

Uses & applications

Predominantly used in jewelry such as earrings, necklaces, and rings; also used in cosmetics and traditional medicine when ground into powder.

Geological facts

Pearls are the only gemstones created by a living creature. Freshwater pearls are typically harvested from mussels in lakes and rivers, particularly in China.

Field identification & locations

Identify by looking for the 'orient' (iridescence) and the 'tooth test' (feels gritty against teeth, unlike smooth plastic beads). Common in jewelry markets worldwide.