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Sperrylite on chalcopyrite with magnetite, Oktyabersky Mine, Norilsk.Field of view 2.2 cm. Sperrylite is a platinum arsenide mineral with the chemical formula PtAs 2 and is an opaque metallic tin white mineral which crystallizes in the isometric system with the pyrite group structure.
Pyrite cubic crystals on marl from Navajún, La Rioja, Spain (size: 95 by 78 millimetres [3.7 by 3.1 in], 512 grams [18.1 oz]; main crystal: 31 millimetres [1.2 in] on edge) Pyrite's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold.
The sulphide minerals are a class of minerals containing sulphide (S 2−) or disulphide (S 2− 2) as the major anion. Some sulfide minerals are economically important as metal ores . The sulphide class also includes the selenides , the tellurides , the arsenides , the antimonides , the bismuthinides, the sulpharsenides and the sulphosalts .
Copperas works are manufactories where copperas (iron(II) sulfate) is produced from pyrite, often obtained as a byproduct during coal mining, and iron. The history of producing green vitriol, as it was known, goes back hundreds of years in Scotland. [1] In 1814 the wool-producing city of Steubenville, Ohio had seven copperas-producing ...
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That is a far cry from the current median net worth in America of $192,900, according to the U.S. Federal Reserve's Survey of Consumer Finances (the average, skewed by richer Americans, clocks in ...
The salary distribution is right-skewed, therefore more than 50% of people earn less than the average net salary. These figures have been shrunk after the application of the income tax . In certain countries, actual incomes may exceed those listed in the table due to the existence of grey economies .
In the richest major cities in America, you need to earn a minimum of nearly $270,000 to be considered part of the top 5% of earners. But in some major cities, you can earn under $200,000 and ...