gemstone
Blue Topaz
Al2SiO4(F,OH)2
Hardness of 8 on the Mohs scale, vitreous luster, orthorhombic crystal system, perfect basal cleavage, and a specific gravity of 3.49 to 3.57.
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Physical properties
Hardness of 8 on the Mohs scale, vitreous luster, orthorhombic crystal system, perfect basal cleavage, and a specific gravity of 3.49 to 3.57.
Formation & geological history
Formed by the cooling of molten magma in pegmatites and in cavities of rhyolite and granite. Most blue topaz on the market is produced by irradiating and heating colorless topaz.
Uses & applications
Widely used in fine jewelry, rings, necklaces, and as a collector gemstone.
Geological facts
Topaz is one of the hardest naturally occurring minerals and is the birthstone for the month of November.
Field identification & locations
Identified by its high hardness, excellent cleavage, and vibrant color; commonly found in Brazil, Sri Lanka, Nigeria, and the United States.
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