gemstone
Alexandrite
Chrysoberyl (BeAl2O4)
AI-generated identification · may be incorrectMohs hardness of 8.5, displays a distinct color-change from green in daylight to red-purple in incandescent light, and has a vitreous luster with an orthorhombic crystal system.
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Physical properties
Mohs hardness of 8.5, displays a distinct color-change from green in daylight to red-purple in incandescent light, and has a vitreous luster with an orthorhombic crystal system.
Formation & geological history
Forms in metamorphic environments where pegmatites interact with chromium-rich ultramafic rocks, typically in high-temperature geological settings.
Uses & applications
Extremely rare and valued for fine jewelry, particularly in collector rings and high-end luxury pieces.
Geological facts
First discovered in Russia's Ural Mountains in the 1830s, it was named after Tsar Alexander II.
Field identification & locations
Identified by its signature color-change optical property and high hardness, primarily mined in Russia, Sri Lanka, and East Africa.
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