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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]
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 PYREX measuring cup manufactured c. 1980, featuring graduations in both U.S. and metric units. Pyrex (trademarked as PYREX and pyrex) is a brand introduced by Corning Inc. in 1915, initially for a line of clear, low-thermal-expansion borosilicate glass used for laboratory glassware and kitchenware.
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Mineral symbols (text abbreviations) are used to abbreviate mineral groups, subgroups, and species, just as lettered symbols are used for the chemical elements.. The first set of commonly used mineral symbols was published in 1983 and covered the common rock-forming minerals using 192 two- or three-lettered symbols. [1]
Intensely blue topaz does not exist in nature and is the result of artificial irradiation. [25] According to the American Gem Trade Association, approximately 30 million carats (6,000 kg or 13,000 lb) of topaz are irradiated every year globally, 40 percent of which were done in the United States as of 1988. [26]
By Krystal Hu and Kenrick Cai (Reuters) -Elon Musk's SpaceX is preparing to launch a tender offer in December to sell existing shares at a price of $135 per share, two sources familiar with the ...
Topaz, a cryptonym for Rainer Rupp (b. 1945), spy for East Germany who worked at NATO headquarters in Brussels William Topaz McGonagall (1825-1902), a Scottish poet. Topaz Winters (b. 1999) Pen name of poet Priyanka Aiyer
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