gemstone
Ruby
Corundum (Al2O3:Cr)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, vivid red to pinkish-red color, adamantine to vitreous luster, and trigonal crystal system with no true cleavage.
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Physical properties
Hardness of 9 on the Mohs scale, vivid red to pinkish-red color, adamantine to vitreous luster, and trigonal crystal system with no true cleavage.
Formation & geological history
Forms in metamorphic and igneous environments, typically within marble, basalt, or placer deposits through aluminum-rich crystallization.
Uses & applications
Extensively used in high-end jewelry, luxury timepieces, and historical laser technology.
Geological facts
Ruby is the red variety of corundum; all other gem-quality colors are classified as sapphire. Chromium trace elements create its distinct fluorescence and red hue.
Field identification & locations
Identified by its extreme hardness, high specific gravity, and distinct red fluorescence under UV light. Found majorly in Myanmar, Thailand, and East Africa.
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