mineral
Mother of Pearl (Nacre)
Aragonite with Conchiolin (CaCO3)
Hardness: 3.5-4.5; Color: Iridescent white, pink, or green; Luster: Pearly; Structure: Orthorhombic (microscopic tablets); SG: 2.7-2.8
- Hardness
- 3
- Color
- Iridescent white, pink, or green
- Luster
- Pearly
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Physical properties
Hardness: 3.5-4.5; Color: Iridescent white, pink, or green; Luster: Pearly; Structure: Orthorhombic (microscopic tablets); SG: 2.7-2.8
Formation & geological history
Biogenic formation by mollusks (oysters, mussels, abalone) where layers are secreted as an inner shell lining.
Uses & applications
Extensively used in jewelry, watch faces, button manufacturing, and decorative inlay work in furniture or musical instruments.
Geological facts
Nacre is composed of hexagonal platelets of aragonite arranged in continuous layers; the iridescence is caused by the light interference from the thickness of these platelets.
Field identification & locations
Identified by its distinctive play of color (iridescence) and smooth, cool surface. Commonly found in coastal areas or freshwater pearl beds.
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