Talk:Greenschist

Untitled

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

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)

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)

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)

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)

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)

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)

pressure error?

Far as I know, 10 kilobars is NOT 58,000 PSI. but I don't know which pressure is "correct" for greenschist. Oreegdreeg (talk) 00:36, 27 July 2022 (UTC)

The kbar values are correct. It looks like the values were tweaked without propagating the change to the conversion template that follows. Fixed now. --Kent G. Budge (talk) 02:03, 27 July 2022 (UTC)