Talk:Greenschist

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Untitled

New page started at Greenschist/Temp pending copyvio resolution. Vsmith 23:52, 7 September 2005 (UTC)[reply]

Petrology

To "clarify", in petrology, minerals which are essential constituents of a rock (in this case, chlorite and actinolite) are listed A + B, and minerals which are commonly seen but are not essential components, are listed as +/- (in this case, albite and epidote). It's fairly straightforward. Rolinator (talk) 02:20, 22 February 2008 (UTC)[reply]

Is all greenstone (or green stone) greenschist?

Greenstone is a term applied to stone used in churches for example in Lincolnshire, which is a long way from any source of volcanic rock (eg. St Peter's Church, South Somercotes) "Greenstone" redirects to greenschist, but is that correct? Can anyone with knowledge of geology (which I have not) help please? --Peter I. Vardy (talk) 14:07, 5 February 2011 (UTC)[reply]

In this case 'Greenstone' refers to the Cretaceous 'Spilsby Sandstone' which contains the green mineral glauconite, the Cretaceous Greensand of southern England is green for the same reason - here is a source for that [1] page 28. Mikenorton (talk) 14:22, 5 February 2011 (UTC)[reply]

Maybe glauconite rather than bluish glaucophane? otherwise agree w/Mikenorton. Greenstone is a general term for green rock whereas greenschist has a specific petrologic meaning. There are a variety of green rocks other than greenschist - glauconitic sandstone, skarn, hornfels and jadeite... Vsmith (talk) 15:10, 5 February 2011 (UTC)[reply]

Two minerals that start with 'glauco' and I get them mixed up, thanks Vsmith for spotting my mistake. Mikenorton (talk) 15:59, 5 February 2011 (UTC)[reply]

Looks like it would be worth adding something to the Greenstone DAB page in the light of this use of the term with a redirect to Spilsby Sandstone Formation - which is a latest Jurassic/early Cretaceous sedimentary rock - if one of us can get around to starting the article. cheers Geopersona (talk) 16:16, 5 February 2011 (UTC)[reply]