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Prior content in this article duplicated one or more previously published sources. Copied or closely paraphrased material has been rewritten or removed and must not be restored, unless it is duly released under a compatible license. (For more information, please see "using copyrighted works from others" if you are not the copyright holder of this material, or "donating copyrighted materials" if you are.) For legal reasons, we cannot accept copyrighted text or images borrowed from other web sites or published material; such additions will be deleted. Contributors may use copyrighted publications as a source of information, but not as a source of sentences or phrases. Accordingly, the material may be rewritten, but only if it does not infringe on the copyright of the original or plagiarize from that source. Please see our guideline on non-free text for how to properly implement limited quotations of copyrighted text. Wikipedia takes copyright violations very seriously, and persistent violators will be blocked from editing. While we appreciate contributions, we must require all contributors to understand and comply with these policies. Thank you. Graeme Bartlett ( talk) 05:36, 14 September 2013 (UTC)
What if any, is the relationship between peridot and peridotite? Are the names a coincidence?
I do not know for sure but would think that it has something to do with the high amount of olivine in both aforementioned substances.
Peridot, the gemstone is in fact, magnesium rich forsterite olivine. Fayalite, the iron olivine, is usually less green and transparent. Rolinator 12:14, 28 December 2005 (UTC)
Yes. Peridot is a gem variety of olivine, while peridotite is a rock composed chiefly of olivine. Peridot, being an olivine, is a mineral. Peridotite, being a rock, is a composition of minerals but composed chiefly of peridot or another olivine mineral. -- Valich 03:39, 31 October 2006 (UTC)
I have added the Geology template as this article has a lot of geology information that hard to ignore. Solarapex 03:32, 11 May 2007 (UTC)
It has been recently discovered that Peridotite can turn CO2 in the air into harmless compounds like calcite at an astonishing rate. since this rock could potentially become a major topic of interest to environmental efforts, it might be a good idea to mention that. source: http://cleantechnica.com/2008/11/10/scientists-discover-rock-that-can-absorb-carbon-dioxide-emissions-directly-from-the-air/ —Preceding unsigned comment added by 69.132.41.57 ( talk) 01:50, 11 November 2008 (UTC)
On 25 May 2016, User:Obradow changed the first sentence of this article from "Peridotite is a dense, coarse-grained igneous rock, consisting mostly of the minerals olivine and pyroxene" to "Peridotite is a dense, coarse-grained igneous rock or metamorphic rock, consisting mostly of the minerals olivine and pyroxene". This assertion about peridotite being a metamorphic rock is unsourced and, I believe, not the current general geological consensus about peridotite. Therefore, I have reverted User:Obradow's edit and I invite discussion on this talk page.
I think the consensus within geology is that peridotite is an igneous rock formed by igneous processes, although it may subsequently be altered/tectonised/metamorphosed to become metaperidotite (or meta-peridotite), a metamorphic rock. I think when some geologists refer to metaperidotites as peridotites they are being inaccurate. (They also do this with other metamorphosed igneous rocks. For example, I think all, or almost all, komatiites are actually metakomatiites but they are often described as komatiites. Similarly, metamorphosed basalts are really metabasalts but they are often described as basalts). I suggest that this shorthand habit of some geologists of inaccurately using igneous rocks names for both the unaltered igneous protolith and the metamophosed rock can confuse anybody who is not an igneous petrologist and this should be avoided on Wikipedia. I welcome comments about this. GeoWriter ( talk) 20:27, 27 May 2016 (UTC)
User:Obradow, in response to your comment, "We are making here glossary of terms, based on current knowledge. It might be not generally known but the life work of professor Nicolas is there. Time will come when glossary of terms and British geological survey get this.", may I remind you of a few things about Wikipedia. Wikipedia follows current consensus. Wikipedia does not aim to lead to a new consensus. The current consensus in geology is that peridotite is an ultramafic plutonic igneous rock (and metaperidotite is its metamorphosed equivalent). Earlier, you gave me the impression that the IUGS's definition of peridotite was worth finding, but now that I have quoted the IUGS definition here, it seems to have lost its importance to you. In future, through debate in academia not on Wikipedia, Nicolas, Violette, you and others may eventually prove to the geological community (e.g. IUGS, AGI and BGS etc.) that peridotite is a metamorphic rock but, currently, the metamorphic origin of peridotite (as opposed to metaperidotite derived from altered igneous peridotite) is a minority view that strongly conflicts with the current consensus. GeoWriter ( talk) 16:46, 28 May 2016 (UTC)
The definitions of peridotite that I have quoted on this talk page are all more recent than at least the early work of Nicolas, but his opinion seems to have been ignored by these definitions. If peridotite is to be regarded as a metamorphic rock, even when in the mantle before any later metamorphism may occur during emplacement to the surface, then why is this metamorphic origin not included in the definitions that I have quoted on this talk page, which define peridotite as igneous only? Why has Nicolas been unable to persuade defining groups such as IUGS, AGI or BGS to accept peridotite as a metamorphic rock? GeoWriter ( talk) 18:04, 28 May 2016 (UTC)
i don't know lets find out Obradow ( talk) 18:09, 28 May 2016 (UTC)
Peridotite is not a rock it is group of diverse rocks. It is certainly not always coarse grained. It can be igneous( both volcanic and plutonic) crustal rock or of mantle origin. So I suggest change : Peridotite is group of diverse rocks of ultramafic composition. In its composition is more similar to some meteorites then the rocks of earth crust, it is characterised with higher amount of Mg and lower Si than average continental crust and even oceanic crust. Volcanic rocks of these composition erupted only in early earth history. Obradow ( talk) 11:11, 28 May 2016 (UTC)
![]() | This ![]() It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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Prior content in this article duplicated one or more previously published sources. Copied or closely paraphrased material has been rewritten or removed and must not be restored, unless it is duly released under a compatible license. (For more information, please see "using copyrighted works from others" if you are not the copyright holder of this material, or "donating copyrighted materials" if you are.) For legal reasons, we cannot accept copyrighted text or images borrowed from other web sites or published material; such additions will be deleted. Contributors may use copyrighted publications as a source of information, but not as a source of sentences or phrases. Accordingly, the material may be rewritten, but only if it does not infringe on the copyright of the original or plagiarize from that source. Please see our guideline on non-free text for how to properly implement limited quotations of copyrighted text. Wikipedia takes copyright violations very seriously, and persistent violators will be blocked from editing. While we appreciate contributions, we must require all contributors to understand and comply with these policies. Thank you. Graeme Bartlett ( talk) 05:36, 14 September 2013 (UTC)
What if any, is the relationship between peridot and peridotite? Are the names a coincidence?
I do not know for sure but would think that it has something to do with the high amount of olivine in both aforementioned substances.
Peridot, the gemstone is in fact, magnesium rich forsterite olivine. Fayalite, the iron olivine, is usually less green and transparent. Rolinator 12:14, 28 December 2005 (UTC)
Yes. Peridot is a gem variety of olivine, while peridotite is a rock composed chiefly of olivine. Peridot, being an olivine, is a mineral. Peridotite, being a rock, is a composition of minerals but composed chiefly of peridot or another olivine mineral. -- Valich 03:39, 31 October 2006 (UTC)
I have added the Geology template as this article has a lot of geology information that hard to ignore. Solarapex 03:32, 11 May 2007 (UTC)
It has been recently discovered that Peridotite can turn CO2 in the air into harmless compounds like calcite at an astonishing rate. since this rock could potentially become a major topic of interest to environmental efforts, it might be a good idea to mention that. source: http://cleantechnica.com/2008/11/10/scientists-discover-rock-that-can-absorb-carbon-dioxide-emissions-directly-from-the-air/ —Preceding unsigned comment added by 69.132.41.57 ( talk) 01:50, 11 November 2008 (UTC)
On 25 May 2016, User:Obradow changed the first sentence of this article from "Peridotite is a dense, coarse-grained igneous rock, consisting mostly of the minerals olivine and pyroxene" to "Peridotite is a dense, coarse-grained igneous rock or metamorphic rock, consisting mostly of the minerals olivine and pyroxene". This assertion about peridotite being a metamorphic rock is unsourced and, I believe, not the current general geological consensus about peridotite. Therefore, I have reverted User:Obradow's edit and I invite discussion on this talk page.
I think the consensus within geology is that peridotite is an igneous rock formed by igneous processes, although it may subsequently be altered/tectonised/metamorphosed to become metaperidotite (or meta-peridotite), a metamorphic rock. I think when some geologists refer to metaperidotites as peridotites they are being inaccurate. (They also do this with other metamorphosed igneous rocks. For example, I think all, or almost all, komatiites are actually metakomatiites but they are often described as komatiites. Similarly, metamorphosed basalts are really metabasalts but they are often described as basalts). I suggest that this shorthand habit of some geologists of inaccurately using igneous rocks names for both the unaltered igneous protolith and the metamophosed rock can confuse anybody who is not an igneous petrologist and this should be avoided on Wikipedia. I welcome comments about this. GeoWriter ( talk) 20:27, 27 May 2016 (UTC)
User:Obradow, in response to your comment, "We are making here glossary of terms, based on current knowledge. It might be not generally known but the life work of professor Nicolas is there. Time will come when glossary of terms and British geological survey get this.", may I remind you of a few things about Wikipedia. Wikipedia follows current consensus. Wikipedia does not aim to lead to a new consensus. The current consensus in geology is that peridotite is an ultramafic plutonic igneous rock (and metaperidotite is its metamorphosed equivalent). Earlier, you gave me the impression that the IUGS's definition of peridotite was worth finding, but now that I have quoted the IUGS definition here, it seems to have lost its importance to you. In future, through debate in academia not on Wikipedia, Nicolas, Violette, you and others may eventually prove to the geological community (e.g. IUGS, AGI and BGS etc.) that peridotite is a metamorphic rock but, currently, the metamorphic origin of peridotite (as opposed to metaperidotite derived from altered igneous peridotite) is a minority view that strongly conflicts with the current consensus. GeoWriter ( talk) 16:46, 28 May 2016 (UTC)
The definitions of peridotite that I have quoted on this talk page are all more recent than at least the early work of Nicolas, but his opinion seems to have been ignored by these definitions. If peridotite is to be regarded as a metamorphic rock, even when in the mantle before any later metamorphism may occur during emplacement to the surface, then why is this metamorphic origin not included in the definitions that I have quoted on this talk page, which define peridotite as igneous only? Why has Nicolas been unable to persuade defining groups such as IUGS, AGI or BGS to accept peridotite as a metamorphic rock? GeoWriter ( talk) 18:04, 28 May 2016 (UTC)
i don't know lets find out Obradow ( talk) 18:09, 28 May 2016 (UTC)
Peridotite is not a rock it is group of diverse rocks. It is certainly not always coarse grained. It can be igneous( both volcanic and plutonic) crustal rock or of mantle origin. So I suggest change : Peridotite is group of diverse rocks of ultramafic composition. In its composition is more similar to some meteorites then the rocks of earth crust, it is characterised with higher amount of Mg and lower Si than average continental crust and even oceanic crust. Volcanic rocks of these composition erupted only in early earth history. Obradow ( talk) 11:11, 28 May 2016 (UTC)