Volume 1

Petralogy. A treatise on rocks / By J. Pinkerton.

  • John Pinkerton
Date:
1811
Catalogue details

Licence: Public Domain Mark

Credit: Petralogy. A treatise on rocks / By J. Pinkerton. Source: Wellcome Collection.

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    others, had passed into the science before it be¬ came classical^. Mountains of black hornblende exist in Si¬ beria, Renovantz, 32 : as the Tigereck, 4 Nev, Nord. Beytr. 192; and others mentioned by 2 Herm. 271. Frequently mixed with qnartz, mica, or felspar, or shorl, and either greenish or black. * Ibid. But it is more commonly foond in mighty strata, as in Saxony; or still oftener as a constituent part of other primeval rocks, as in syenite and grunstein; sometimes in layers in gneiss, or granular limestone, or argillite; and sometimes in horn porphyry. 2 Berg, Jour, 1788. 508. 1 Lenz. 325. 1 lEmmerling, 325; or in the gullies of granite. Herm. Ibid. Florn- blende slate was observed among the primeval rocks on the ascent of Mont Blanc, 7 Sauss. 241, 253, mixed with plumbago ; Ibid, and on its summit, Ibid. 289.*^ Strata of schistose hornblende occur some¬ times in gneiss, as already mentioned. At Mil- * Blendy in German, sometimes implies hlind, sometimesjfa/^e or deceitful \ but the name seems rather to have arisen from its having the appearance of hlendcy an ore of zinc, vsrhich'was also called pseudo galena. Blend, or in modern German blind, never has the final e: and there would be no sense in blind horn. But as the substance much resembles black blende, and, when struck, often crumples like horn, the etymology is very clear. A French writer rightly translates it Blende de 'come. Hornstein and Hornsilver are translucent as horn. Sites.
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