mineraloid
Conch Pearl
Calcareous concretion (CaCO3)
Hardness: 2.5-3.5; Color: Pink, orange, or white; Luster: Porcellaneous; Crystal Structure: Amorphous/Microcrystalline; Cleavage: None; Flame-like patterns (chatoyancy).
- Hardness
- 2
- Color
- Pink, orange, or white
- Luster
- Porcellaneous
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Physical properties
Hardness: 2.5-3.5; Color: Pink, orange, or white; Luster: Porcellaneous; Crystal Structure: Amorphous/Microcrystalline; Cleavage: None; Flame-like patterns (chatoyancy).
Formation & geological history
Produced primarily by the Queen Conch (Alstrombus gigas) in tropical marine environments through the secretion of calcium carbonate layers around an irritant.
Uses & applications
Highly prized in fine jewelry including rings, earrings, and necklaces; collector's item due to rarity.
Geological facts
Unlike traditional pearls, conch pearls are not nacreous. They are estimated to occur in only one out of every 10,000 to 15,000 shells, and only 10% are gem quality.
Field identification & locations
Identify by its characteristic 'flame pattern' surface and lack of nacreous luster. Found in the Caribbean Sea near the Bahamas and Florida Keys.
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