gemstone
Ruby
Corundum (Al2O3:Cr)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, red color due to chromium, vitreous to adamantine luster, trigonal crystal system, and no cleavage.
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Physical properties
Hardness of 9 on the Mohs scale, red color due to chromium, vitreous to adamantine luster, trigonal crystal system, and no cleavage.
Formation & geological history
Forms in metamorphic and igneous rocks, specifically marbles and basaltic terrains, over millions of years.
Uses & applications
Used extensively in high-end jewelry, watchmaking bearings, and lasers.
Geological facts
Ruby is one of the traditional cardinal gemstones, with pigeon's blood rubies from Myanmar being the most prized.
Field identification & locations
Identified by its extreme hardness, red fluorescence under UV light, and high specific gravity; found in Myanmar, Thailand, and East Africa.
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