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This article was the subject of a Wiki Education Foundation-supported course assignment, between 7 January 2019 and 9 April 2019. Further details are available on the course page. Student editor(s): HannahWV. Peer reviewers: Yunxin Song.
Above undated message substituted from Template:Dashboard.wikiedu.org assignmentbyPrimeBOT (talk) 17:48, 16 January 2022 (UTC)Reply
This section is frankly terrible and I'd suggest simply deleting it, it's hard to even tell what it's supposed to be about. Is it about identifying if something is a clay or identifying the particular mineral composition? — Preceding unsigned comment added by AngryZinogre (talk • contribs) 04:57, 8 October 2018 (UTC)Reply
I think I read that clay is slippery as a result of aluminum hydroxide gels like those described at wikipedia yet theres also a colloidal goop explanation.
I am not good at editing the main page stuff. But though i should add that Montmorillonite clay is the most common member of the smectite clay family. Montmorillonite is generally referred to as “nanoclay”. It is also the most common material used in plastic nanocomposites. Nanoclay: a clay from the smectite family. Smectites have a unique morphology, featuring one dimension in the nanometer range. Think of them like a deck of cards. They are relatively long and wide compared to their height. If you were to spread them out equally three dimensionally you have reached optimization for most uses. While looking at the spaced out cards one dimension makes them almost impossible to see, yet their effects are extreme. It is currently being use by many companies for various uses. Example companies are Bayer AG, Nanocor, PolyOne, Honeywell, Mitsubishi Gas Chemical, etc. Everyone keeps hearing about nanotechnology, especially about carbon nano-tubes. Nanoclays have made just as much of an impact already but dont have the following.
Text which was added by anonymous user User:68.120.90.223 should be either removed or modified heavily. It definitely has something which is worth keeping but it also contains childish nonsenses like "clay is soil found in water" etc. This article should begin with geological explanation/definition and it is not what clay is technically, it is what clay actually is. Siim 19:34, 23 November 2005 (UTC)Reply
The Wikipedia Help Desk has received a message from Professor Tropf of Cal State Northbridge. Apparently, he tried to rewrite the article to include the use of clay in art. I quote from his e-mail: I tried to amend the article with a paragraph on the use of clay as an artistic medium, but it was removed.
Why was my plain-language addition to a highly technical article removed? How can I write a plain-language explanation of what "clay" is and have it posted on Wikipedia?
I suspect that he was the anonymous user referred to above.
I will seek further information from him and see if we can we develop a compromise. Capitalistroadster 04:17, 25 November 2005 (UTC)Reply
I re-inserted the edit mentioned as a start for a new subsection. The info is good, with some tweaks. I was previously pondering how to make it fit when another editor removed it. The added section probably needs some tuning for better flow. Vsmith 04:53, 25 November 2005 (UTC)Reply
Professor Tropf has e-mailed that he has edited the article which currently appears as the introduction. His text is:
"Clay is a generic name for a number of different types of soils found in or near water. Clay is denser and heavier than most other types of earth. Naturally high in water content, clay is malleable and can be easily shaped by the hands. When dried in the sun it becomes harder, but sun-dried clay will break or crumble over time. Clay can be hardened permanently by heating it in a special oven called a “kiln,” which provides more intense heat, even temperature and faster drying time. The process of hardening clay in a kiln is called “firing.” Clay is found in a variety of colors from gray to reddish orange, but during or after the firing process a clay object can be painted or glazed."
Capitalistroadster 17:11, 25 November 2005 (UTC)Reply
I'd like to say "thank you" to the editors of wikipedia and V. Smith, who have helped me create a much better article on the subject of clay. I ask my freshmen-level students to select a work of art and write a research paper on how that artwork was created. Those who choose a ceramic artwork have had a very difficult time finding information on clay as an artistic medium. The original wikipedia article was full of highly technical terms, with no common language explanation for beginners. Now we have an article that can be understood by an undergraduate student with no experience in science, but still includes informaton for advanced scholars.
Ralph Tropf, MFA
Cal State Northridge
Can someone explain what happens to clay as it is fired? I suspect the silicate drys out, then welds to itself, but that seems like it would only happen in a narrow temperature range (lest the piece melt). Any ideas> —BenFrantzDale 13:20, 20 December 2005 (UTC)Reply
Okay, so I have a question and an idea. How did people, and how do people, make high quality pure clay for firing in a kiln from clay that probably has silt, sand and organic matter in it?
Well, I have an idea. In soils we learned that clay particles will remain in suspension after two hours, at which time the silt and sand will have dropped out. So assuming that usable firing clay needs only have silt and sand removed, one could get a canister of muddy water, let it sit for two hours and then siphon off as much water as possible without disturbing the silt and sand at the bottom. Then that water, once evaporated, would yeild very nearly 100% clay, right? I just don't know if 100% clay is what the "clay" we used in grade school to make ash trays is.
Also, should this neat little link on making clay to paint with be on the external links on the main page? I'm ages five and up... http://americanhistory.si.edu/kids/santos/TryItWaterBasedPaints.html
Hello Ballista, I reverted your edit back to my earlier because:
1) You stated Clay is a sedimentary deposit, however some primary deposits are found
2) You stated hydrous silicate mineral, where as clay is not one mineral but a group of minerals and include, for example, halloysite, kaolinite and montmorillionite
Best regards, Andy
Would just like to point out that primary clay does not necessarily = Kaolins. Kaolins are clay minerals that are formed by the breakdown of feldspar. Formation of kaolin/ china clay is often associated with the degredation of feldspar found in basic igneous rocks such as gabbro and granite. Whilst deposits of Kaolin would probably be primary, it is possible to get primary clays that are not kaolin. A primary clay merely refers to a clay deposit that is found where it was formed. For example clay formed from mudstones could be considered primary, providing it hadn't undergone any form of transportation. — Preceding unsigned comment added by Bbbill123 (talk • contribs) 20:45, 13 June 2012 (UTC)Reply
More reference to standards, and keeping clear the difference to the standards; USDA vs BS5930 80.229.47.244 15:57, 25 June 2007 (UTC)jago25_98Reply
Hi. I just found bit of guidance from Wikipeida itself: "Deleting useful content. A piece of content may be written poorly, yet still have a purpose. Consider what a sentence or paragraph tries to say. Clarify it instead of throwing it away." This is pretty much what I have been saying all along. —Preceding unsigned comment added by 81.153.65.237 (talk) 21:37, 26 September 2007 (UTC)Reply
It would really be helpful if anon users who want to add constructively to this topic would create user names on wiki. I just had an anon user remove an easily sourced edit (which I reverted and sourced with a widely distributed and authoritative geologic text) for some reason which I can't fathom. Not quite vandalism because, true my edit wasn't sourced initially and the user had the courtesy to comment at least to their rationale, but my edit was easily verified and following the link to either bauxite or aluminum would have backed up the sentence. Bottom line is, this is a very important topic in the earth sciences. It is only a matter of time before editors from the geology project, soil project and civil engineering project start adding to this article. Anyone who is now anon and wants to contribute should not feel bad when editors from these projects revert unsourced content.Drillerguy 15:10, 1 October 2007 (UTC)Reply
Anonomyous user 86.154.127.142, citing no sources, and adding no further description of what clay IS, claims (in his comment reverting my and Vsmith's edits) that laterites, which are combinations of gibbsite (a chemically weathered product of the widely recognized clay mineral kaolinite), along with concentrations of residual clay minerals such as kaolinite, illite and montmorillonite and other clay mineral sized crystals are not "clay". Well, that might be true, but I have sourced what I have written and this user can't be bothered to do the same. Nor can they be bothered to sign up an account with Wikipedia. I will track down more sources and add citations for what I write to this article. If anon user 86.154.127.142 continues to revert without citing sources I will start to flag those edits as vandalism. Drillerguy 20:19, 1 October 2007 (UTC)Reply
From a pottery point of veiw, clay is made of sediments (of particle size <0.002mm) together with clay minerals, which are themselves aluminas or silicates, chemically bonded with water. these clay minerals have a crystalline structure. It is the clay minerals, rather than the sediment component, that give wet clay its plasticty, and cause it to shrink as it dries.
This section is the stubbiest part of the article. Once cleaned up, the section should be moved to clay minerals. -- Paleorthid (talk) 18:27, 24 November 2007 (UTC)Reply
↔♣m³m²#clay is made out of fine-grained minerals and is dug out of earth in large clumps. Lcay is formed over long periods of weathering of rocks. —Preceding unsigned comment added by 72.87.235.174 (talk) 00:03, 16 September 2008 (UTC)Reply
I have removed the category 'ceramic material' for the simply reason clay is not. It can however be a ceramic raw material. This is a very, very important difference. Ceramic materials are just that: ceramic. These are man-made materials which during their formation have been subject to high temperatures to impart permanent chemical and physical changes. Whereas 'ceramic raw materials' are those materials used at the start of this process: they are the pre-cursor materials. —Preceding unsigned comment added by 210.54.238.178 (talk) 02:59, 6 April 2009 (UTC)Reply
The above is somewhat misleading. When dry and placed in water, clay will change from being a solid mass into a slurry. —Preceding unsigned comment added by 59.154.42.131 (talk) 04:10, 1 April 2010 (UTC)Reply
The comment(s) below were originally left at Talk:Clay/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
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Last edited at 06:50, 8 December 2007 (UTC). Substituted at 11:52, 29 April 2016 (UTC)
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The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:
Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 19:37, 28 January 2021 (UTC)Reply
The article states, "Clay is a very common substance. Shale, formed largely from clay, is the most common sedimentary rock" referencing Principles of Sedimentology and Stratigraphy, Boggs, 2006, 4th Edition, p. 140. If anyone has access to that edition, I'd appreciate a confirmation that the reference statres shale is the most common. I borrowed from Boulder's CU library Boggs 2012 5th edition (the closest they had to the 4th) and found these quotes which come close but none of which quite say that shale is the most common...
"Mudstones and shales are abundant in sedimentary successions, making up roughly 50 percent of all the sedimentary rocks in the geologic record." p. 118
"Origin and Occurrence of Mudstones and Shales: ... The fine-grained siliciclastic products of weathering greatly exeed coarser particles; thus, fine sediment is abundant in many sedimentary systems. Because fine sediment is so abundant... mudstondes and shales are by far the most abundant type of sedimentary rock. They make up roughly 50 percent of the total sedimentary rock record. ... Nearly pure shale units hundreds of meters thick also occur." p. 122
BTW, at Glacier National Park, the shale deposits there are much thicker. After taking a Geological Society of America's 2016 Glacier Nat'l Park field trip with a dozen geologists, referring now to an online post I wrote at the time, one deposit in the park is of 30,000 foot thick thin-layered rippled slate. That's a lot more than hundreds of meters. And our guide, a local expert and professional geologist, would only quantify the massive mud deposits there as "off the scale".
Anyway, Boggs p. 122 continues, "A few shales (and mudstones)... are particularly well known owing to their thickness [though Boggs gives no range], widespread areal extent... include... the Devonian-Mississippian Chattanooga Shale and equivalent formations that cover much of North America and whose widespread extent is still poorly explained..."
So again, if anyone can confirm that Shale is the most common, per Boggs or other source, thanks! Bob Enyart, Denver KGOV radio host (talk) 21:15, 5 August 2021 (UTC)Reply
The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:
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people eat clay because of cravings and when they smell wet soil after raining the crave for clay . 41.114.144.52 (talk) 18:45, 15 October 2023 (UTC)Reply