gemstone
Blue Topaz
Al2SiO4(F,OH)2
AI-generated identification · may be incorrectHardness of 8 on the Mohs scale, vitreous luster, brilliant blue color often achieved via irradiation and heat treatment, and distinct basal cleavage.
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Physical properties
Hardness of 8 on the Mohs scale, vitreous luster, brilliant blue color often achieved via irradiation and heat treatment, and distinct basal cleavage.
Formation & geological history
Forms in pegmatites, high-temperature vapor cavities, and granite or rhyolite igneous rocks through fluorine-bearing gas action.
Uses & applications
Widely utilized in high-end fine jewelry, rings, and pendants.
Geological facts
Natural blue topaz is exceptionally rare, meaning the vast majority on the market are colorless stones treated with radiation.
Field identification & locations
Identified by its high hardness, excellent transparency, and distinctive crystal habits, commonly sourced from Brazil, Sri Lanka, and Nigeria.
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