gemstone
Ruby
Corundum (Al2O3:Cr)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, vivid red color due to chromium, vitreous to adamantine luster, and no cleavage.
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Physical properties
Hardness of 9 on the Mohs scale, vivid red color due to chromium, vitreous to adamantine luster, and no cleavage.
Formation & geological history
Forms in metamorphic and igneous rocks, typically in marble or aluminum-rich gneiss, over millions of years.
Uses & applications
Used primarily in fine jewelry, laser technology, and precision watch bearings.
Geological facts
Ruby is one of the traditional cardinal gemstones, with high-quality specimens commanding higher per-carat prices than diamonds.
Field identification & locations
Identified by its extreme hardness, red fluorescence under UV light, and distinct crystal habit; found extensively in Myanmar, Mozambique, and Thailand.
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