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- W2010546700 abstract "This well-known rock, the porphyrites of Pliny, the typical porphyry of the earlier, and one of the typical hornblende-porphyrites of more recent petrologists, has already been described in considerable detail by numerous writers, especially in an admirable paper by the late Prof. Delesse. His observations upon a large number of specimens collected at Djebel Dokhan, the Porphyrites Mons of the ancients, by M. Lefebvre, are remarkable for the precision with which they were made at a period when the microscopic examination of thin sections of rock was unknown, or at all events in the very year (1850) when such sections were first made by Dr. H. C. Sorby. The observations of Delesse were made chiefly with low magnifying-powers upon polished surfaces of the rock, and by reflected light. Brief descriptions of it, based on the examination of thin sections, have also been published in several works. On looking at a section recently prepared from a specimen of this rock, I was surprised to see that it consisted, not of a continuous section of hornblende-porphyrite, but of fragments of that rock held together by a micro-crystalline granular cement. On referring to Delesse9s paper, I found that he described two kinds of the Porfido-rosso antico, one being the rock in its normal condition, the other a brecciated variety. It is to the latter that I would now direct attention. The specimen is of reddish-brown or maroon colour, flecked with small white or reddish-white crystals of felspar and dark hornblende crystals, which as" @default.
- W2010546700 created "2016-06-24" @default.
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- W2010546700 date "1885-02-01" @default.
- W2010546700 modified "2023-10-16" @default.
- W2010546700 title "On Brecciated Porfido-rosso antico" @default.
- W2010546700 doi "https://doi.org/10.1144/gsl.jgs.1885.041.01-04.22" @default.
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