gemstone
Ruby
Corundum (Al2O3)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, deep red color due to chromium, subvitamrous to adamantine luster, trigonal crystal system.
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Physical properties
Hardness of 9 on the Mohs scale, deep red color due to chromium, subvitamrous to adamantine luster, trigonal crystal system.
Formation & geological history
Formed in metamorphic or igneous rocks under high temperature and pressure conditions over millions of years.
Uses & applications
Extensively used in high-end jewelry, watchmaking bearings, and lasers.
Geological facts
Ruby is one of the traditional cardinal gemstones, with the red color caused by trace amounts of the element chromium.
Field identification & locations
Identified by its extreme hardness, red streak, and characteristic hexagonal crystal habit when rough.
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