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Osmium is a hard, brittle, blue-gray metal, and the densest stable element—about twice as dense as lead. The density of osmium is slightly greater than that of iridium ; the two are so similar (22.587 versus 22.562 g/cm 3 at 20 °C) that each was at one time considered to be the densest element.
The mineral is colorless, milky-white, grey, pale-yellow, green, to pale-brown. The specific gravity is 4.3, which is high for a translucent mineral. [2] It fluoresces light blue under both long- and short-wave UV light, and is phosphorescent under short-wave UV light. [2] Witherite forms in low-temperature hydrothermal environments.
Zinc is bluish-white and lustrous, [9] though most common commercial grades of the metal have a dull finish. [10] Zinc is also referred to in nonscientific contexts as spelter. [11] Cadmium is soft, malleable, ductile, and with a bluish-white color. Mercury is a liquid, heavy, silvery-white metal.
Not all of these metals are found in all white metal alloys. Metals are mixed to achieve a desired goal or need. Metals are mixed to achieve a desired goal or need. As an example, a base metal for jewellery needs to be castable , polishable , have good flow characteristics, have the ability to cast fine detail without an excessive amount of ...
Scheelite is a calcium tungstate mineral with the chemical formula Ca W O 4.It is an important ore of tungsten (wolfram). Scheelite is originally named after Swedish chemist Carl Wilhelm Scheele (1742–1786).
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