Talk:Porphyry (geology)

Question

Sixteenth-century "porphyry" in Poland and the Czech Republic, mentioned here, is something else: is it red granite? --Wetman 05:10, 14 January 2007 (UTC)

Is the "Bruton and Wilkinson" correct? I find a number of mentions on the web of "Burton and Wilkinson" in reference to porphyry, but only find "Bruton" on pages reproducing this wikipedia article. I am changing the "Bruton" to "Burton" for the time being, as I assume it refers to the same incident cited in Manufacturer and builder / Volume 20, Issue 1, January 1888 which attributes it in words similar to this article (including the date), but gives the name as "Burton". See http://memory.loc.gov/cgi-bin/query/r?ammem/ncps:@field(DOCID+@lit(ABS1821-0020-26)):: 76.100.208.65 17:16, 21 April 2007 (UTC)

Yes, looking at the article itself, it appears it is Burton: http://ebooks.library.cornell.edu/cgi/t/text/pageviewer-idx?c=manu;cc=manu;rgn=full%20text;idno=manu0020-1;didno=manu0020-1;view=image;seq=00020;node=manu0020-1%3A1 2601:140:C000:25C6:DCF3:983:473B:9CC (talk) 06:09, 28 July 2016 (UTC)

Since this was so very important to ancient Romans, they must have made some beautiful statues and monuments. It would be appropriate to include picture of these, even at the expense of some of the existing photos. R Stillwater (talk) 01:54, 8 November 2008 (UTC)

Porphyritic

Since there is an aphanitic and phaneritic page, and since geologists do not use porphyry and porphyritic the same, and since all porphyritic rocks are NOT porphyrys, I am considering making a seperate page for porphyritic and replacing the redirect. Thoughts? Qfl247 (talk) 19:27, 24 May 2010 (UTC)

That makes sense, the section of the lede on 'porphyritic' sits a bit uneasily with the rest of the article I think. Mikenorton (talk) 19:54, 24 May 2010 (UTC)

Etymology

Knowing next to nothing about geology, I decided to throw this one out on the Discussion page instead: "porhyros" means "crimson", not purple, in Greek. However, the rest of the related paragraph in the introduction refers to a purple rock. So, I do not know how that correction may affect said paragraph (unless I am mistaken and we are dealing with one of the multitude of English-Greek false friends. -Anagogist (talk) 01:56, 9 March 2011 (UTC)

Unless every classical scholar I have ever read is wrong, Prophyrogenitos means "born in the purple", used to describe those children born when their parent was emperor. Likewise "porphyros" was used to describe the imperial robes, which were purple as well. So I think you may be misinformed on this. Or, perhaps, modern usage has deviated from the classical, which is always possible. 76.111.27.52 (talk) 22:26, 22 February 2015 (UTC)

Napoleon

The article lists Napoleon's tomb at Les Invalides as made of porphyry but elsewhere I have read it's actually red quartzite form Russia (or Finland, then part of the Russian Empire. Since it has a reference, I had not corrected it. Could somebody check? --Error (talk) 23:30, 24 November 2012 (UTC)

Looking at the most detailed pictures on Commons, it's definitely not a porphyry and red quartzite looks right - it's well-banded and there are microfaults offsetting the bands. Apparently he wanted the porphyry used by the Roman Emperors, but the red quartzite was the closest they could manage in appearance [1]. Mikenorton (talk) 00:31, 25 November 2012 (UTC)

However, the source cited looks solid enough - after all the tomb is the book's whole subject. On the other hand various sources describe the rock as a red quartzite from Shoksha in Karelia, Finland. Mikenorton (talk) 00:54, 25 November 2012 (UTC)

The Les Invalides article states: a tomb made of red quartzite and resting on a green granite base - and that image is not of a porphyry. I'd say chop the one-liner from the article as it doesn't add much and we seem to have disagreeing refs. Vsmith (talk) 01:53, 25 November 2012 (UTC)

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Map

I'd like a map of the quarry location and the Roman via. --Error (talk) 00:09, 5 December 2016 (UTC)