mineral
Cat's Eye Chrysoberyl
Chrysoberyl (BeAl2O4)
AI-generated identification · may be incorrectHardness: 8.5 (Mohs scale), Color: Yellow-green to green, Luster: Vitreous to silky, Crystal structure: Orthorhombic, Specific gravity: 3.5-3.8, Features chatoyancy (cat's eye effect) caused by tiny needle-like inclusions.
- Hardness
- 8
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Physical properties
Hardness: 8.5 (Mohs scale), Color: Yellow-green to green, Luster: Vitreous to silky, Crystal structure: Orthorhombic, Specific gravity: 3.5-3.8, Features chatoyancy (cat's eye effect) caused by tiny needle-like inclusions.
Formation & geological history
Formed in granitic pegmatites and mica schists during high-pressure, high-temperature metamorphism. Often found in alluvial deposits (river sands).
Uses & applications
Primarily used as a gemstone in high-end jewelry and as a prized specimen for mineral collectors.
Geological facts
The 'cat's eye' effect is called chatoyancy. When viewed under a single light source, a sharp band of light appears on the stone. Chrysoberyl is the third hardest natural gemstone commonly used in jewelry, surpassed only by diamond and sapphire/ruby.
Field identification & locations
Identify by looking for the sharp, moving line of light across the cabochon-cut surface (the 'eye'). Found in Sri Lanka, Brazil, Madagascar, and Russia. It often displays a 'milk and honey' effect when light is shone from the side.
