The Elements of economic geology

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Monograph

Identifikator:: 1008918695

URN:: urn:nbn:de:zbw-retromon-20162

Document type:: Monograph

Author:: Jürgensohn, Arved http://d-nb.info/gnd/1045767883

Title:: Weltporto-Reform

Place of publication:: Berlin

Publisher:: Druck und Verlag von Liebheit & Thiesen

Year of publication:: 1910

Scope:: 1 Online-Ressource (XXIV, 317 Seiten)

Digitisation:: 2017

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Kapitel XI. Weltverkehr, Weltbriefmarke und Weltmünze

Collection:: Economics Books

ORES OF FIVE MINOR METALS 119 dyke, and penetrate and replace the pyroxene; hence, there also, the nickel ores are later than the consolidation of the igneous rock. Sout Arrica—Nickel ores of no economic importance occur at Insizwa in the N.E. of Cape Colony (at 29° 20’ E,, 20° 45’ S.) in an intrusive sill which W. H. Goodchild has ex- Plained as due to the separation of the sulphides from a molten norite, T. C. Phemister (Tr. IL. M.M., xxxiii, 1924, pp. 519- 20) has shown that the rock is an olivine-gabbro with some Picrite on the lower margin; and that the sulphides were not the first formed constituents in the gabbro, as they often replace biotite, occur in secondary quartz, and were deposited along fractures. The Bushveld laccolite in the Transvaal includes dissemin- ated and massive nickel-bearing sulphides which are regarded by P. A. Wagner as primary and magmatic ; but he describes the sulphides in the ore as unquestionably later than the silicates, and as in part replacing the silicates; and the ore bodies cut across the ** pseudo-stratification * of the rocks and their mineralization has been guided by older fractures (G.S.S. Afr., Mem. 21, 1924, p- 147). A small occurrence of nickel-cobalt ore in a diorite at Talnotry, near Newton-Stewart in S.W. Scotland, has been attributed to igneous segregation. The sulphides were de- posited along a fault after the igneous rock had undergone great hydrothermal changes. MERCURY MercuRY—Uses AnD Price—Mercury or Quicksilver (Hg; at. wt, 200; sp. gr. liquid, 13-6; melting-point, — 38°F. ; boiling-point, 357° F. with slow volatilization at ordinary temperatures) is the only metal which is liquid at ordinary climatic temperatures. It is used in barometers and thermometers owing to its heaviness and its regular ®Xpansion and contraction with changes of temperature. Its most extensive use is for chemical purposes, and as a drug; its other chief uses are as a pigment, a detonator— its use in percussion caps developed the fire-arm from the ancient flintlock—as amalgam in dentistry, and in mirrors. It 1s of great service in gold mining, as it enables minute particles of gold to be recovered by amalgamation.

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