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On some Cornish Tin-stones and Tin-capels
Published online by Cambridge University Press: 14 March 2018
Extract
The Minerals Associates of Cassiterite.--These are much the same in Cornwall as have been observed in other tin-producing districts, as in Saxony, Bohemia, Brittany, Finland, Spain, the Malay Peninsula, Banca, Blitong, Queensland, New South Wales, Tasmania, &c. In the following lists of minerals which are associated with Cassiterite in the different kinds of country-rock in Cornwall, I only refer (a) to those which appear to have been formed contemporaneously with the Cassiterite, and (b) to those which have been observed in immediate contact with it and mostly deposited upon it.
- Type
- Research Article
- Information
- Mineralogical magazine and journal of the Mineralogical Society , Volume 5 , Issue 24 , April 1883 , pp. 121 - 130
- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland 1883
References
• I regret to say that thts comfortable house is now no longer an inn, and that the old sinall building is again the only place of entertainment. Provisions and rugs--impedimenta worse than hammers--must be taken now.
• P. Doyle, Quart. Journ. Geol. Soc. 138. May 1879.
• Recently precipitated tin-oxide is rather readily soluble in many menstrua, and I find that native tin-oxide (casslterite) is very perceptibly acted upon by dilate aqua regia, especially when it is finely powdered.
• M6moire sur le gisement, la constitution, et l'origine des areas de minexai d'6tain. Ann. des Mines, xx, 1841.
† See " The Hensbarrow Granite District, by J. H. Collins, Truro, 1878; and Foster, Quart. Jour. Geol. Soc. Nos. 135, 1878. See also Foster, Tin Deposits of East Wheal LovelL Trans. Roy. Geol. Soc Corn. 1875. p. 174.
‡ Davey, Trans. Roy. Geol. Soc.. Corn. iv. p. 484.
§ The Hensbarrow Granite District, p, 39. It is obscrvablethat these loose crystal line particles of quartz, as well as those existing in the natural China clay rock Carclazyte), always have rough irregular corroded surfaces, as if they had been partially dissolved by some strong solvent.
Its occurrence in the tin mines of the Erzegebirge (Saxony and Bohemia) Zinnwald and Ehrenfriedersdorf is recorded by Frcnzel, and noted by Dana in his Second Appendix (p. 24).
* Of which .60 was lost at a temperature of 120° C.
* The anklyses referred to are as follows:--a, from Zillerthal (Dana, anal 3); b. from Litchfield, Conn. (Dana, anal. 6); c. from Ross Hill, Iowa (Dana, anal. 19); d. from Unionville (Dana, anal. 27); and e. from Lambhoga (IJeddle, anal. 1, Chapters on the 31ineralogy of Scotland, The Micas, p. 13).
* I found in one specimen 0.10 per cent. of fluorine, and in another 0.15 per cent. It is worthy of note that Delabeche, many years since, estimated the fluorine in the ordinary granites of Cornwall and Devon toamountto from 0'18 to 0.21 per cent.
† That the circulation of stanniferous solutions is still going on, or at least was so in geologically very recent times, is indicated by the occurrence of tin in the interior of a deer's horn (see supra, 2nd paper), and perhaps of that in the "alluvial faults" of Rosevear Moor.
* Report Roy. hist. Cern. 1845, p. 20.
† Ueber dus Vorkommen des Mines in Silicaten, yon F. Sandberger, Sitzb. d. K.K. .Akad. d. Wiss.. Wien, 4 Mar. 1878. See also Zeitschr. der deutschen geol: Gesellschaft, 1880. Stelsner combats this theory.
* To what extent these deposits were produced by waters rising from below, and how far they were influenced by lateral pel:colation, cannot be determined. The effects produced on the contents of veins by the nature of the enclosing rock, and the frequent occurrence of deposits of ore parallel with the dip of the adjoining country, would, however, lead to the conclusion that lateral infiltrations must have materially influenced the results, philllps, Q. J. Geol. Soc. 1875, p. 342.