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cassiterite mineral britannica

Cassiterite mineral Britannica

Cassiterite, heavy, metallic, hard tin dioxide (SnO2) that is the major ore of tin. It is colourless when pure, but brown or black when iron impurities are present. Commercially important quantities occur in placer deposits, but cassiterite also occurs in granite and pegmatites. Early in the 15th

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1911 Encyclopædia Britannica/Cassiterite Wikisource, the

Jun 09, 2014· 1911 Encyclopædia Britannica/Cassiterite. The mineral has a high refractive index, and strong bi-refringence. Certain transparent yellow and brown specimens, cut as gem-stones, exhibit considerable brilliancy. The hardness of cassiterite is 6.5, so that it cannot be scratched with a knife, and is nearly as hard as quartz. Its specific

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Carnotite mineral Britannica

Carnotite, radioactive, bright-yellow, soft and earthy vanadium mineral that is an important source of uranium. A hydrated potassium uranyl vanadate, K2(UO2)2(VO4)2·3H2O, pure carnotite contains about 53 percent uranium, 12 percent vanadium, and trace amounts of radium. It is of secondary origin,

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Cassiterite for sale eBay

New Listing 115g Natural Cassiterite Mineral Specimen/China. $0.01. 0 bids. Free shipping. Ending Apr 30 at 5:11PM PDT 6d 6h. Watch. From China. 50g Natural Cassiterite Mineral Specimen/China. $1.75. 2 bids. Free shipping. Ending Apr 28 at 2:37PM PDT 4d 3h. Watch. From China.

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tin Definition, Properties, Uses, & Facts Britannica

Tin occurs in grains of the native metal but chiefly as stannic oxide, SnO 2, in the mineral cassiterite, the only tin mineral of commercial significance. The metal is obtained from cassiterite by reduction (removal of the oxygen) with coal or coke in smelting furnaces. No high-grade deposits are known.

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Pitchblende mineral Britannica

Pitchblende, amorphous, black, pitchy form of the crystalline uranium oxide mineral uraninite (q.v.); it is one of the primary mineral ores of uranium, containing 50–80 percent of that element. Three chemical elements were first discovered in pitchblende: uranium by the German chemist Martin

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Mineral processing Concentration Britannica

Mineral processing Mineral processing Concentration: Concentration involves the separation of valuable minerals from the other raw materials received from the grinding mill. In large-scale operations this is accomplished by taking advantage of the different properties of the minerals to be separated. These properties can be colour (optical sorting), density (gravity separation), magnetic

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topaz Description & Distribution Britannica

Topaz, silicate mineral that is valued as a gemstone. It is believed that the topaz of modern mineralogists was unknown to the ancients and that the stone called topazos was the mineral chrysolite or peridot. The ‘topaz’ in the Old Testament also may have been chrysolite.

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Cassiterite: Mineral information, data and localities.

The mineral name is derived from the term “Cassiterides” which was applied 'islands off the western coast of Europe' in pre-Roman times (the exact location of these 'islands' has been hotly debated over the years, current thought is that the source was probably mainland Spain and that even 2000 years ago, traders had a habit of providing misleading locality information to protect their

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Tin processing Britannica

Tin processing, preparation of the ore for use in various products. Tin (Sn) is a relatively soft and ductile metal with a silvery white colour. It has a density of 7.29 grams per cubic centimetre, a low melting point of 231.88 °C (449.38 °F), and a high boiling point of 2,625 °C (4,757 °F). Tin is

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Cassiterite Definition of Cassiterite at Dictionary

Cassiterite definition, a brown or black mineral, tin dioxide, SnO2, that crystallizes in the tetragonal system; tinstone: the principal ore of tin. See more.

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