mineral

Cat's Eye Chrysoberyl

Chrysoberyl (BeAl2O4)

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.

Hardness: 8

Identified May 29, 2026More mineral →

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Physical properties

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.