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IV.—Notes on some Ligurian and Tuscan Serpentines
Published online by Cambridge University Press: 01 May 2009
Extract
Notwithstanding the distinct assertion by more than one geologist1 of the intrusive character of the serpentines of these districts, some uncertainty seems to exist on this point and still more as to the original character of the rock. Hence the result of my examination of a few localities, and of my subsequent studies of the rocks then obtained, may be of sufficient interest to justify publication.
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References
page 362 note 1 D'Achiardi, vol. ii. p. 180. Stoppani, Corso di Geologia, iii. § 701. Jervis, Quart. Journ. Geol. Soc. vol. xvi. p. 480.
page 363 note 1 An aluminous variety. of hornblende; it has been found at Zermatt (see Dana, Text-Book of Mineralogy, p. 277), and at Syra (Zeitsch deutsch. geol. Ges. Bd. xxviii. heft 2, p. 248). For the above determination, and the opportunity of comparing specimens, I have to thank Mr. T. Danes, F.G.S., of the British Museum, to whom, as not seldom before, I had recourse when in perplexity as to the name of the mineral.
page 364 note 1 Quart. Journ. Geol. Soc. vol. xxxiii. p. 890.Google Scholar
page 364 note 2 Quart. Journ. Geol. Soc. vol. xxxiv. p. 770.Google Scholar
page 366 note 1 I should perhaps state that there is nothing to favour the idea of this crushing having heen sudden, or associated with any exceptional amount of heat. It may have been, the result of long-continued pressure and yielding now here now there—possibly, indeed, the process of crushing and cementation may have been repeated more than once.
page 366 note 2 Quart. Journ. Geol. Soc. vol. x. sec. xxxiii. p. 916.Google Scholar
page 367 note 1 Quart. Journ. Geol. Soc. vol. xxxiv. p. 771.Google Scholar
page 367 note 2 Quart. Journ. Geol. Soc. vol. xxxiii. p. 925.Google Scholar
page 368 note 1 An analysis of the diallage is given by D'Achiardi, vol. ii. p. 84, and of the felspar (labradorite), id. p. 104. The rock is commonly called “granitone” by Italian geologists.
page 368 note 2 I believe this is the “gabbro rosso” of some authors.
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