Talk:Kaolinite

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Kaolin[edit]

Kaolin, along with Feldspar and Quartz, make up the 'clay' that was (and is) used in making fine china. The LIMOGES region of France (250 miles SW of Paris in the Vienne Valley) was responsible for starting a craze for fine China in the latter half of the 19th century. The composition makes a hard paste that when fired at high temperatures produces a beautiful translucent porcelain. This means there is no crazing as there is with soft paste porcelain. A piece manufactured in 1860 looks just the same in 2008 if cared for properly. I can provide more info if anyone wantsGotchakatya (talk) 21:32, 20 January 2008 (UTC)[reply]

Hi - I'm not sure if your comments would added to what already exists. What you describe is porcelain, and this already has a article in Wikipedia. Also though factories around Limoges did, and still do, produce porcelain they were not "responsible for starting a craze for fine China." Also providing a suitable glaze is used, and properly fired, crazing is not a problem on soft paste porcelain. (both hard and soft porcelain are still made in Limoges) —Preceding unsigned comment added by 86.147.253.110 (talk) 19:50, 17 February 2008 (UTC)[reply]

Vsmith stated that he/she removed a commercial adv. However, the removal also removed some important information about an environmentally friendly pesticide that has become available. I placed that information on there originally; the information is valid and should not be removed. At the time of placement, the link was the only source I could find that offered further information. If you can find a non-commercial link that offers significant further information, please be my guest. I don't have time to go looking. But do not remove valuable information and information sources without finding better. Pollinator 22:30, Oct 27, 2004 (UTC)

Still consider it an adv. - moved link to External links section. Re-instated my other edits that you also reverted. Tried to improve the article flow. I don't really see the commercial info as that important. It is NOT an insecticide. I leave it to you to find unbiased data to support this commercial link. I will delete it in the future if no noncommercial links are provided. It is not Wiki policy to promote commercial products. -Vsmith 03:21, 28 Oct 2004 (UTC)

The name of the Chinese town is Kao-Ling (or Gaoling, "high ridge"), located in the Jiangxi Province of southeast China. —Preceding unsigned comment added by MinMad (talk • contribs) 08:12, 1 August 2008 (UTC)[reply]

Discovery?[edit]

How is kaolin supposedly discovered in 1867 when it's been mined there for over a thousand years?

Good point ... it's been mined around the world long before 1867, and in the case of Cornwall in the UK since 1746. Perhaps the original author could elaborate Regards, Andy

Chemical formula[edit]

I was tempted to put {{contradict}} on this article, but the contradiction was rather minor. Anyway, it says at the top of the article that Kaolinite is Al₂Si₂O₅(OH)₄, but in the info box it says Al₄[Si₄O₁₀](OH)₆. Which is it? ~ Oni Lukos _ct 12:50, 11 June 2006 (UTC)[reply]

Fixed. Disagreement in references, Deer says 4:4:10:6 all the others including my Dana say the other. So, went with Dana and online refs for consistency. Vsmith 13:48, 11 June 2006 (UTC)[reply]

noodle?[edit]

"semi-dry noodle" ??? --Gbleem 13:15, 17 April 2007 (UTC)[reply]

I also couldn't figure out if this was a real term, so I deleted it and replaced it with "chip," like how silica is sometimes packaged. 184.67.135.194 (talk) 18:38, 13 October 2022 (UTC)[reply]

Why??? Theriac 15:19, 17 April 2007 (UTC)[reply]

Why what? --Gbleem 21:20, 17 April 2007 (UTC)[reply]

Hi Gbleem. Apologies for being flippant earlier, I was just responding in a similar fashion to your original comment. I was wondering why you highlighted semi-dry noodle. ThanxTheriac 22:33, 17 April 2007 (UTC)[reply]

Ummm ... maybe because he doesn't know what the term means and can't easily find out? CountMacula (talk) 04:30, 5 August 2011 (UTC)[reply]

Images[edit]

Please can someone give an idea of size, such as a scale bar. This is very basic stuff. Not including these is bad practice and makes the images of very little value. —Preceding unsigned comment added by 81.153.64.39 (talk • contribs)

I have answered here. Best regards Rhanyeia 12:31, 16 August 2007 (UTC)[reply]

Hydrocephalus research (Bering, 1962)[edit]

"Kaolin is also used experimentally in animal models of hydrocephalus research (Bering, 1962).[5]"

This obscure sentence is very unclear and the use of kaolin in this study is not obvious. Is a kaolinite paste used to reproduce the shape of a skull to determine some biometric parameters ? This is very specialized and likely not relevant to an encyclopedia article. Moreover, in the link to Hydrocephalus research I could not see any reference to kaolin. As a consequence, I would suggest to develop, or better to remove this sentence and to store it on the discussion page along with the corresponding reference. Shinkolobwe 15:47, 30 October 2007 (UTC) .[reply]

Removed reference and proper formatting[edit]

Kaolin is also used experimentally in animal models of hydrocephalus research (Bering, 1962).

Bering, E.A., Jr. (1962). "Circulation of the cerebrospinal fluid. Demonstration of the choroid plexuses as the generator of the force for flow of fluid and ventricular enlargement". Journal of Neurosurgery. 19: 405–413.{{cite journal}}: CS1 maint: date and year (link) CS1 maint: multiple names: authors list (link) .

Shinkolobwe 15:17, 31 October 2007 (UTC)[reply]

What's the difference with Halloysite?[edit]

http://en.wikipedia.org/wiki/Halloysite looks the same as Kaolin. Should those two be merged? Yurivict (talk) 08:25, 5 June 2009 (UTC)[reply]

Halloysite and kaolinite are different minerals. Although both are kaolins, halloysite is not the same as kaolin.

Chìshízhī is Halloysite, not Kaolinite[edit]

The article currently states: "Kaolin is known in traditional Chinese medicine by the name chìshízhī (赤石脂), literally 'crimson stone resin'."

Howevver, it seems that chìshízhī (赤石脂) usually refers to Halloysite specifically and not Kaolinite (look at the colour in these pictures). Please comment and/or edit the article appropriately if you have further insight. — AjaxSmack 01:57, 5 March 2010 (UTC)[reply]

Hi - it is not possible to distinguish kaolinite and halloysite by colour. —Preceding unsigned comment added by 210.54.238.178 (talk) 23:39, 7 March 2010 (UTC)[reply]

Kaolinite has also seen some use in organic farming, as a spray applied to crops to deter insect damage, and in the case of apples, to prevent sun scald.[edit]

could whoever posted this please use a citation this finding would be instrumental in a study i am doing — Preceding unsigned comment added by 138.26.188.95 (talk) 21:57, 13 July 2011 (UTC)[reply]

What is the difference between Kaolin and Kaolinite?[edit]

Exactly what is Kaolin? I find that it seems to be the main component in the sealant/gasket material I might use. It may be buried in the article somewhere, but I didn't see it. Probably a good idea to make the distinction near the top of the article. CountMacula (talk) 04:34, 5 August 2011 (UTC)[reply]

Kaolin is a rock or sedimentary deposit rich in kaolinite and other very similar clay minerals, such as dickite and halloysite which require X-ray analysis for identification, as well as other "impurities". The last sentence of the first paragraph sums it up, but could perhaps be expanded a bit. Vsmith (talk) 18:20, 5 August 2011 (UTC)[reply]

"Rocks that are rich in kaolinite are known as china clay, white clay, or kaolin." Okay, thanks, Vsmith. I missed that somehow. But the sentence is ambiguous ... all rocks or some rocks? And are all three terms "china clay", "white clay" and "kaolin" supposed to have the same meaning? "Kaolin is a rock or sedimentary deposit rich in kaolinite and other very similar clay minerals, such as dickite and halloysite" seems to be a clear-enough definition of kaolin. CountMacula (talk) 20:46, 6 August 2011 (UTC)[reply]

"not strictly crystalline" -- is this discussing a quasicrystal structure?[edit]

I can't think of other concepts that would cover something with long-range order but are not strictly crystalline. elle _{vécut heureuse} ^{à jamais} (be free) 21:50, 11 October 2011 (UTC)[reply]

A general comment: quasicrystals are a very special case. There are many other options for "not strictly crystalline"; two common ones are: (i) macro mix of crystalline and disordered phases (ii) microscopic defects present at intermediate concentrations (not low enough to be ignored, not high enough to discard the crystal phase), and forming an irregular substructure. Materialscientist (talk) 22:24, 11 October 2011 (UTC)[reply]

defect? defective? defacto?[edit]

The current text reads:

"Further heating to 925–950 °C converts metakaolin to a defect aluminium-silicon spinel, Si3Al4O12, "

I'm pretty sure that "a defect ... spinel" isn't quite right. Defect-ridden? DeFacto? Synthetic? I can't figure out what they meant.

Riventree (talk) 01:12, 22 January 2012 (UTC)[reply]

Removed "defect". I think it meant "defect-rich", but not sure, and perhaps defects can be avoided. Materialscientist (talk) 01:41, 22 January 2012 (UTC)[reply]

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Alumosilic acide[edit]

Kaolinite Al2Si2O5(OH)4 actually is AlOOH.SiO2 aq. it forms plagioclase and orthoclase with Na, K and Ca. less known Mg, Fe, etc. Those are Salts of Kaolinite.

An acid does not have to be water soluble.

It can be written as HAlSiO4

in other words Alumosilic acide.

name occurs on Mg pharmatologic compounds.

Consequences: Ammoniumkaolinite exists. What is that? if Ammoniumkaolinite exists is Kaolinite soluble in Ammonia?

salts of kaolinite are as to say the Siliciumoxide ""hydrates"" of aluminates. (where SiO2 refers to silic acide)

can Acidic properties of Kaolinit be proven, such as reaction heat with I,II?

Where also Mullite behaves like that and hydrogenBentonite/Kyanite. the hydrogenBentonite would need a chemical name on alumosilic acides. (also have ammonia salts/minerals?)

Wikistallion (talk) 09:06, 10 June 2018 (UTC)[reply]

Production table[edit]

Hello all - I'm new to creating tables for Wikipedia, indeed new to Wikipedia as a whole. I've just created and added a table summarising production output by country. As the data is presented as a single column it is rather long. It would be preferable if the data was presented in multiple columns. Is this possible? Does anyone know how to do it? If so please would they advise in a way that a necomer to Wikipedia can understand. Thank you in advance.User name for this site (talk) 13:40, 19 February 2023 (UTC)[reply]

Disclaimer for medical section[edit]

Is a disclaimer required for the “medical” section in “applications”? 86.163.161.206 (talk) 19:38, 11 June 2023 (UTC)[reply]

Contradiction[edit]

In the article on halloysite it states that the output of the halloysite mine at Matauri BayinNew Zealand is 20 thousand tonnes PA, which appears to be in conflict with the 11 thousand tonnes attributed to NZ in the list of outputs. Reference is Global Occurrence, Geology And Characteristics Of Tubular Halloysite Deposits.' I. Wilson and J. Keeling. Clay Minerals, Vol 51, 2016. pg 309-324. — Preceding unsigned comment added by 2404:4404:27EB:5E00:B821:3730:DD1F:E1CA (talk) 09:31, 17 June 2023 (UTC)[reply]

How could massive chunks of them survive till today?[edit]

Global lava erosions happen constantly, plus other plate tectonics factors, how can massive chunks of them survive more than a million years? Tanengtiong0918 (talk) 00:06, 2 December 2023 (UTC)[reply]