gemstone
Blue Topaz
Al2SiO4(F,OH)2
AI-generated identification · may be incorrectHardness of 8 on Mohs scale, vitreous luster, brilliant blue color, orthorhombic crystal system, perfect basal cleavage, and specific gravity around 3.5.
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Physical properties
Hardness of 8 on Mohs scale, vitreous luster, brilliant blue color, orthorhombic crystal system, perfect basal cleavage, and specific gravity around 3.5.
Formation & geological history
Forms in pegmatites and high-temperature hydrothermal veins, often associated with granitic rocks and rhyolites.
Uses & applications
Widely used in fine jewelry, rings, pendants, and as a collector gemstone due to its striking brilliance.
Geological facts
Natural blue topaz is extremely rare; most commercial blue topaz is produced by irradiating and heating colorless topaz.
Field identification & locations
Identified by its high hardness, excellent cleavage, and vitreous luster; commonly mined in Brazil, Sri Lanka, and Nigeria.
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