gemstone
Possible blue sapphire
Corundum (Al₂O₃), possibly blue sapphire
AI-generated identification · may be incorrectSmall, dark-blue, lustrous object; if sapphire, Mohs hardness 9, trigonal crystal structure, and no true cleavage. The image is too small and indistinct to confirm its identity or properties.
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Physical properties
Small, dark-blue, lustrous object; if sapphire, Mohs hardness 9, trigonal crystal structure, and no true cleavage. The image is too small and indistinct to confirm its identity or properties.
Formation & geological history
Sapphire forms when aluminum-rich rocks crystallize or undergo metamorphism; deposits occur in several geological settings and ages.
Uses & applications
Sapphires are used in jewelry and watch components; industrial synthetic corundum is used in abrasives and durable optical parts.
Geological facts
Blue color commonly comes from trace iron and titanium in corundum.
Field identification & locations
The pictured object could also be another blue mineral or a non-geological bead; hardness, refractive index, and magnified examination are needed for identification. Natural sapphires occur in places including Sri Lanka, Myanmar, Madagascar, and Australia.
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