gemstone
Alexandrite
Chrysoberyl (BeAl2O4)
AI-generated identification · may be incorrectMohs hardness 8.5; exhibits a dramatic color change from green in daylight to purple-red in incandescent light; vitreous luster.
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Physical properties
Mohs hardness 8.5; exhibits a dramatic color change from green in daylight to purple-red in incandescent light; vitreous luster.
Formation & geological history
Forms in metamorphic environments where pegmatites interact with chromium-rich ultramafic rocks.
Uses & applications
Highly prized as a rare gemstone in luxury jewelry and collector markets.
Geological facts
First discovered in Russia's Ural Mountains in the 1830s and named after Tsar Alexander II.
Field identification & locations
Identified by its signature pleochroism and distinct color shift under different light sources; found in Russia, Brazil, and Sri Lanka.
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