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The Hubbard Mine for tungsten was operated by the Rare Minerals Company from 1898 and later by the American Tungsten Mining and Milling Company, ceasing operations after a fire in 1916. [ 4 ] [ 5 ] Besides tungsten, the mine was also a source of beryl , opal , topaz , tourmaline and 60 other crystals and minerals in varying quantities.
Tungsten (also called wolfram) [14] [15] is a chemical element; it has symbol W and atomic number 74. It is a rare metal found naturally on Earth almost exclusively ...
Atomic number (Z): 47: Group: group 11: Period: period 5: Block d-block Electron configuration [] 4d 10 5sElectrons per shell: 2, 8, 18, 18, 1: Physical properties ...
Embossed silver sarcophagus of Saint Stanislaus in the Wawel Cathedral, created in the main centers of 17th-century European silversmithery – Augsburg and Gdańsk [1]. A silversmith is a metalworker who crafts objects from silver.
Most definitions of the term 'refractory metals' list the extraordinarily high melting point as a key requirement for inclusion. By one definition, a melting point above 4,000 °F (2,200 °C) is necessary to qualify, which includes iridium, osmium, niobium, molybdenum, tantalum, tungsten, rhenium, rhodium, ruthenium and hafnium. [2]
The word repoussé is French and means "pushed up", ultimately from Latin pulsare, which means "to push".Repoussage is the noun to refer to the technique, with repoussé being an adjective referring to a piece to which the technique has been applied (e.g. "repoussé work", "repoussé piece").
It was the result of a partnership between Santa Fe Studio Workshop — located inside Segura's studio and gallery space, Santa Fe Silverworks — and the local nonprofit Innovate+Educate, which ...
Hexa(tert-butoxy)ditungsten(III) is a coordination complex of tungsten(III). It is one of the homoleptic alkoxides of tungsten. A red, air-sensitive solid, the complex has attracted academic attention as the precursor to many organotungsten derivatives. It an example of a charge-neutral complex featuring a W≡W bond, arising from the coupling ...