Talk:Gneiss

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Issue with the second picture

Second picture looks like a migmatite, not gneiss. I think that it's better to remove it. Siim 19:30, 16 September 2005 (UTC)[reply]

Contradictory statements

Your article says that gneisses do not carry large quantities of micas, then it goes on to say that a gneiss may be classified as biotite gneiss. These two statements are contradictory because biotite is a mica. I suggest deleting the reference to micas.

The article on biotite actually says that it is found in gneisses.

Mica

When shales and mudstones are metamorphosed they turn initially to slates and then to coarse-grained foliated rocks rich in shiny mica called schists, and finally to coarse-banded rocks called gneisses. The Geology of Britain, Peter Toghill.

I think this means that if it is foliated or in 'leaves' like a mica then it's a schist, if it is banded (maybe blocky?) it's a gneiss. I would appreciate comments and clarification here. PeterGrecian 12:22, 31 October 2006 (UTC)[reply]

DWAYNE JOHNSON=THE ROCK

I don't have time to fix it but "metamorphic Dwayne Johnsons"? I get it, it is kind of funny but could be confusing to people without a geology learnin. —Preceding unsigned comment added by 71.103.202.224 (talk) 21:26, 6 April 2009 (UTC)[reply]

Expand

Can anyone help expand this article. --Extra999 (Contact ^me + _contribs) 03:26, 28 April 2010 (UTC)[reply]

I need an answer to my question.

What is the origin of Rhyolite & Gneiss? — Preceding unsigned comment added by 68.186.22.149 (talk) 17:16, 10 November 2011 (UTC)[reply]

The two form very differently, you should take a look at our metamorphic rock and rhyolite articles, which may help. Mikenorton (talk) 20:20, 10 November 2011 (UTC)[reply]

The Old Boy?

I've been familiar with gneiss for many years but not once have I ever heard any geologist refer to it as 'the old boy' - though this useage appears to be referenced. Does anyone have a copy of Murray from which this phrase uttered by some geologists purports to come? cheers Geopersona (talk) 17:16, 28 August 2012 (UTC)[reply]

Don't need a local "sometimes" used nickname in this general article. And the Lewisian gneiss page has no mention of it ... chopped. Vsmith (talk) 18:02, 28 August 2012 (UTC)[reply]

(EC)I might have heard it, I've certainly heard of it. Here's a quote from John Sutton and Janet Watson's 1987 forward to Geol Soc Special Publication 27 on 'Evolution of the Lewisian and Comparable Precambrian' "For these rocks (the 'Old Boy' of the Geological Survey) make up the bulk of the complex," so no difficulty getting a supporting source - see also [1] & [2]. Mikenorton (talk) 18:04, 28 August 2012 (UTC)[reply]

I'm quite happy to see it go from here, but perhaps I'll add it to the Lewisian complex page. Mikenorton (talk) 18:06, 28 August 2012 (UTC)[reply]

Composition

Here is an idea. Why not use the section titled "Composition" to actually discuss the composition of the various gneisses? What a concept! This section is poor. It is NOT useful to tell the reader what gneiss is NOT.216.96.77.42 (talk) 22:23, 15 November 2012 (UTC)[reply]

Infobox

We need more info about gneiss in the Infobox. If anyone has more info about gneiss that could be added to the Infobox, please add it to the Infobox.Punk4orchrist (talk) 17:57, 13 January 2015 (UTC)[reply]

Gneiss is a rock type; the infobox you want is template:Infobox rock. Vsmith (talk) 19:16, 13 January 2015 (UTC)[reply]