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Marcasite jewellery is jewellery made using cut and polished pieces of pyrite (fool's gold) as gemstone, and not, as the name suggests, from marcasite. [1] Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite is more stable and less brittle than marcasite.
Marcasite reacts more readily than pyrite under conditions of high humidity. The product of this disintegration is iron(II) sulfate and sulfuric acid. The hydrous iron sulfate forms a white powder consisting of the mineral melanterite, FeSO 4 ·7H 2 O. [13] This disintegration of marcasite in mineral collections is known as "pyrite decay".
A modern watchmaker at his workstation; he wears a magnifying loupe to more easily see the small parts of a watch A watchmaker's lathe in use to prepare a decorative watch component cut from copper. A watchmaker is an artisan who makes and repairs watches. Since a majority of watches are now factory-made, most modern watchmakers only repair ...
E. Gluck Corporation is an American watch manufacturer headquartered in Little Neck, New York. [1] [2] It was founded in 1956 by Eugen Gluck.E. Gluck Corporation manufactures watches under two flagship proprietary brands, Armitron and Torgoen.
Maurice Lacroix was founded in Sainelegier in the highlands of Jura [1] as part of Desco von Schulthess of Zürich in 1975. Founded in 1889, Desco von Schulthess (Desco) is an older company with roots in the silk trade.
Some watches of this period had the setting-arbor at the front of the watch, so that removing the crystal and bezel was necessary to set the time. Watch keys are the origin of the class key, common paraphernalia for American high-school and university graduation. Many keywind watch movements make use of a fusee, to improve isochronism. The ...
Talk about a tale of two cities. A new report calls New York one of the best cities in the country for an active lifestyle — while a spot right across the Hudson River ranks as one of the worst ...
The watch was an 18-size, full plate design. In 1869, the National Watch Company won "Best Watches, Illinois Manufacture" at the 17th Annual Illinois State Fair, for which it won a silver medal. [3] The company officially changed its name to the Elgin National Watch Company in 1874, as the Elgin name had come into common usage for their watches.
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