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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]
The American Golden Topaz, housed in the National Museum of Natural History, Washington D.C.. The American Golden Topaz, a 172-faceted topaz weighing 22,892.5 carats (4.57850 kg; 10.0939 lb), is the largest cut yellow topaz in the world, and one of the largest faceted gems of any type in the world. [1]
Sapphires are a precious gemstone, a variety of the mineral corundum, consisting of aluminum oxide (α-Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, copper, or magnesium.
Searles Valley Minerals Inc. is a raw materials mining and production company with corporate offices in Overland Park, Kansas. It is owned by the Indian company Nirma. [1] [2] It has major operations in the Searles Valley centered in Trona, California where it is the town's largest employer.
Topaz and tourmaline stand out. Imperial Topaz, a valued variety of topaz, is only found in Ouro Preto. Brazil is the world's leading producer of topaz. It is also one of the world's largest tourmaline producers. [10] [11] [12]
Dinosaur hall, hall 10 at NHM Vienna Kākāpō specimens at the museum. The earliest collections of the Natural History Museum Vienna date back more than 250 years. It was the Holy Roman Emperor Francis I, Maria Theresa’s husband, who in 1750 purchased what was at the time the world's largest collection of natural history objects from the Florentine scholar and scientist Jean de Baillou.