cassiterite


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cassiterite

(kəsĭt`ərīt), heavy, brown-to-black mineral, tin oxide, SnO2, crystallizing in the tetragonal system. It is found as short prismatic crystals and as irregular masses, usually in veins and replacement deposits associated with granites. Since it is hard, heavy, and resistant to weathering, it often concentrates in alluvial deposits derived from cassiterite-bearing rocks. It is the principal ore of tin and is mined in many countries; the most important sources are Malaysia, Thailand, China, Indonesia, Bolivia, and Russia. Except for Bolivia, nearly all of this production is from alluvial deposits.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Cassiterite

 

(or tinstone), a mineral with the chemical composition Sno2. Theoretically it contains 78.62 percent Sn but usually includes impurities of Nb, Ta, Zr, Sc, W, and Fe; thus, the Sn content varies within 68–78 percent.

Cassiterite crystallizes in the tetragonal system, forming prismatic or dipyrimidal crystals. Geniculated twins are characteristic. The crystalline structure is analogous to that of rutile. Cassiterite is usually encountered in the form of small and large crystals, drusoid aggregates, or compact granular masses as well as in the form of cryptocrystalline, colloform segregations, concretions, and sinter formations. The color is dark brown, almost black, yellow with a reddish brown cast; nearly colorless varieties are also known. Cassiterite has an adamantine luster, a hardness of 6–7 on the mineralogical scale, and a density of 6, 040–7, 120 kg/m3 (lowest in light-colored cassiterite).

The deposits are usually genetically linked with granitic rocks. The most interesting commercial accumulations of the mineral are characteristic for hydrothermal quartz-cassiterite and sulfide-cassiterite veins. Cassiterite is stable in zones of oxidation and surface weathering; with the destruction of primary deposits, it accumulates in placers. In the USSR, cassiterite deposits are found in the northeast in Primor’e, in Middle Asia, and in the Kazakh SSR. Abroad, it is found in Malaysia, Thailand, Indonesia, the People’s Republic of China, Bolivia, Nigeria, and elsewhere. Cassiterite is the chief ore for obtaining tin.

A. B. PAVLOVSKII

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

cassiterite

[kə′sid·ə‚rīt]
(mineralogy)
SnO2 A yellow, black, or brown mineral that crystallizes in the tetragonal system in prisms terminated by dipyramids; the most important ore of tin. Also known as tin stone.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Located in Sichuan's Pingwu county, the Xuebaoding beryl-scheelite vein deposit (32[degrees]26'N, 104[degrees]31'E) is famous for producing superb scheelite, beryl and cassiterite specimens.
This locality's specimens of intensely orange scheelite crystals associated with large cassiterite crystals and with tabular beryl have, of course, become famous during the past ten years.
Considering that only one microcrystal of cassiterite was found in one L1-type fluid inclusion, as identified by Raman spectrometry, it may be suspected that the high Sn contents in the L1 fluid reflect the heterogeneous trapping of nanoinclusions of cassiterite rather than oversaturation of the magmatic fluid relatively to Sn[O.sub.2].
For this reaction, the solids obtained through the method of controlling precipitation, (Romarchite (SnO), Cassiterite (Sn[O.sub.2])), and the [Al.sub.2][O.sub.3]as a reference catalyst.
PUNIA, MANIEMA, DRC -- A 9.5kg bag of cassiterite, dug from the ground by a local miner here and tagged by a government representative, made the Punia mine the latest in a growing number of sites indoctrinated in the iTSCi conflict-free mineral traceability and due diligence program.
The mineralisation consists of chalcopyrite, cassiterite, sphalerite, pyrite, and arsenopyrite, and is essentially stratiform, dipping to the northwest at about 30 degrees.
The diffraction peaks showed at 2[theta] = 26.6, 34.8, and 52.8[degrees] are referred to as cassiterite phase (JCPDS number 41-1445), and they are enhanced with the decrease of the molar ratios of Ti/Sn.
All the sharp diffraction peaks were assigned, corresponding to the (110), (101), (200), (111), (211), (220), (002), (310), (112), (301), (202), and (321) reflections of Sn[O.sub.2] cassiterite phase (JCPDS card no.
Which metal is produced from the ore cassiterite? 9.
Mined largely in the DRC under questionable human rights standards, wolframite, cassiterite, coltan and gold are then processed for the manufacture of electronic components found in cellphones around the world.