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Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]
Dark-blue varieties of topaz, including American Super Blue and London Blue, are the results of neutron bombardment, [24] while lighter sky-blue ones are often those of electron bombardment. [24] Swiss Blue, subtly lighter than the US variety, is the result of a combination of the two methods. [24]
Topaz is not produced commercially. No context. The blue topaz is found naturally in many locations. Covered in topaz to the extent that topaz is found widely. Disputed by the article cited above. The Texas Natural Science Center exhibits a 1778 carat blue topaz found in a Brazilian mine.
2nd row: rare purple topaz, champagne coloured topaz on albite, rare topaz and green hydroxylherderite matrix. 3rd row: naturally cut topaz, irradiated blue topaz, white topaz on matrix Rare purple-lavender hued topaz on a matrix from Katlang in Mardan District, Khyber Pakhtunkhwa [1] [2] There are many types of gemstones of Pakistan.
A cleaning company has been fined $171,000 after federal investigators found 11 children working a "dangerous" overnight shift at a meat processing plant in Iowa.
However, although this filter is unable to predictably discriminate between natural and synthetic emerald, it has been subsequently found capable of distinguishing aquamarine, blue topaz, and their blue synthetic spinel simulants, because unlike natural gemstones, blue cobalt-containing synthetic spinels emit a red fluorescence under white light.
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