The Elements of economic geology

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Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

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Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part II. Ore deposits

Collection:: Economics Books

CHAPTER V ORES OF TIN AND TUNGSTEN Tin Ores? Tin—Historic InTEREST—Tin (Sn from Latin stannum— the English name comes from the Greek, zinn ; at. wt., 118; 5p. gr., 7-1 to 7-3; melting-point, 450° F.) the white metal, is of special historic interest from its influence on early culture and prehistoric trade; most of the Mediterranean supply was obtained by the Pheenicians from Cornwall. The present main use of tin is in * tinned plate,” as a thin alm preserves iron from rust and corrosion. ; PxEuMaTOLYTIC ORIGIN—Tin is obtained from cassiterite (Sn0Q,), which occurs in altered granites. It has been pre- pared artificially by passing stannic fluoride (SnF,) with boric acid over hot lime; it was probably mainly formed by the decomposition of stannic fluoride (SnF,) by boric acid, producing tin oxide and some borate such as tour- maline, Many occurrences, however, such as stalactites, \mpregnations in buried timber, and pseudomorphs after felspar, are due to deposition from solution, as tin oxide is slightly soluble in boiling water.2 Tin pyrites or stannite, a mixed sulphide of copper, tin, and iron, has been mined in Cornwall, New South Wales, and Chile. Cassiterite being heavy and resistant of weathering re- mains as a residual mineral in alluvial deposits. It generally Pays to mine only where concentrated by denudation of tin- bearing granites. Tin ores of commercial value are remark- ably restricted in distribution (Fig. 25). The chief fields are ! For the tin fields of the world and a full bibliography, see W. R. I ones, Tinfields of the World, 1925. Ct. Collins, Miner. Mag, iv, 1880, pp. 1, 103 ; Vv, 1883, p. 121.

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