Talk:Mica

message: Where is mica found in the u.s. or not? where?!?!
Where is  mica found?  Is it in the u.s.?
Sign your comments. Don't know about the U.S., but you find plenty of it in Cordoba, an Argentine province. Slartibartfast1992 23:03, 31 May 2007 (UTC)
replies: text: What good is signing your comments if you're not going to use your real name??  Anonymous is just as credible as "Slartibartfast1992."  —Preceding unsigned comment added by 216.207.242.34 (talk) 14:34, 21 May 2009 (UTC)
replies: text: It's not about credibility, it's about identifying who said what in a comment thread. Captain Quirk (talk) 18:20, 13 June 2020 (UTC)
thread_title:  ? 

message: "hydro-muscovite with H3+ along with K in the X site."
I do not believe that the H3+ ion exists.
Was H3O+ intended?
Michael H 34 16:52, 26 March 2007 (UTC)
replies: text: Fixed, thanks - you could have fixed it yourself, that's what this wiki is about. Cheers, Vsmith 17:22, 26 March 2007 (UTC)
thread_title:  Correction ? 

message: Does anyone understand what "This map is consistent with incomplete set of data too as long as the top producer is known" actually means? It does not make a great deal of sense to me. Also data should not be published if it is incomplete.  —Preceding unsigned comment added by 81.157.127.176 (talk) 21:52, 23 September 2007 (UTC)
thread_title: Map

message: Someone says that life originated between mica sheets. It's on LiveScience.
Lunakeet (talk) 15:04, 15 March 2008 (UTC)
thread_title:  Mica Hypothesis 

message: Perhaps the info. in this paper may be used in the article. MP (talk•contribs) 11:22, 10 July 2008 (UTC)
thread_title:  Link to article 

message: Isnt it used as a glittery pigment in cosmetics? 
Only there is mica in my lipgloss.  —Preceding unsigned comment added by 81.79.224.9 (talk) 13:21, 25 October 2008 (UTC)
thread_title:  Glitter 

message: Removed the following from the article:
:== Role in primitive life ==
:Helen Hansma, a research scientist affiliated with the University of California, Santa Barbara, has proposed that the unique properties of Mica enabled the formation of life in the oceans of the distant past.Life On Earth May Have Originated As The Organic Filling In A Multilayer Sandwich Of Mica Sheets
NPR: Life on Earth May Have Begun In Between Rocks In atomic force microscopy, biological samples are placed on mica because it is atomically flat. Even bare DNA molecules may be seen as small ridges. Inspecting mica under the microscope, bits of algae and other organic materials  suggested to her the possibility early life molecules could have evolved within mica sheets in a communal fashion eons before the evolution of cell membranes or lipid vesicles. Mica might have provided a secure place with time and space  and protection from the open ocean.  Some earliest evidence for life's most primitive cells is in Akilia Island,  Greenland, where biotite, a common mica, is also found. Potassium ions, which  hold the sheets of mica together, are also required by cells. Primordial soup  with amino acids and simple building blocks of life might have seeped between  the water-loving mica sheets. The large planar area between sheets might have  facilitated the building of long chain molecules. Negative spaces holding the potassium ions on mica are 0.5 nm apart, as are the single stranded DNA molecules (letters of genetic code), as well as amino acids in proteins. Clay also  provides spacing that might encourage this process, but the planar area might better encourage the process. Expansion and contraction caused by temperature changes and ocean currents might provide mechanical energy to help rearrange the molecules and trigger the formation of chemical bonds.
Seems a bit overdone for a hypothezised concept based on a "press release" type reference. Needs better refs and updated info if included. The Greenland-biotite links are maybe WP:SYNTH? Yes, there is biotite from Akilia Island - it was used to date the igneous gneiss. So was there biotite in the banded iron formation sediments that contain the carbon isotope evidence for ancient life? Rather tenuous connection seems to me. Solid refs needed. Vsmith (talk) 02:19, 23 August 2009 (UTC)
thread_title:  Role in primitive life? 

message: The cite for "The largest sheet of mica ever mined in the world came from a mine in Denholm, Quebec, Canada." -" ^  "Denholm" (in French). MRC de La Vallée-de-la-Gatineau. http://www.mrcvg.qc.ca/textes/mun-denholm.shtml. Retrieved 2008-08-27." does not mention either the largetst piece of Mica; or anything else about mica (and yes I read french fluently). Either provide a real citation or get rid of this tidbit.76.75.84.52 (talk) 02:07, 24 June 2010 (UTC)
replies: text: Indeed. Fixed. Materialscientist (talk) 03:17, 24 June 2010 (UTC)
thread_title:  Flawed citation 

message: "The mica found in the pyramid of the sun has been identified as mined in Brazil, that is 3400 km from the pyramid complex."
That's just plain wrong. The citation at the bottom (http://books.google.com/books?id=sIYpx9mzd4gC&pg=PA102&hl=en#v=onepage&q=mica&f=false) is telling us the exact opposite of what is written in the article. The mica came from a local quarry near Teotihuacan, not from Brazil. This should be fixed.  —Preceding unsigned comment added by 92.224.6.12 (talk) 22:21, 8 July 2010 (UTC)
replies: text: Removed controversial statement. Materialscientist (talk) 22:33, 8 July 2010 (UTC)
thread_title:  Another flawed citation 

message: From time to time one hears of a substance called "motor mica," a fine white powder used as dry lubricant in some types of electric motors, among other things.  It is similar to powdered graphite in some of its properties, but is a dielectric.
Is this a powdered form of the same substance the main article discusses, or is it something else entirely?  The article mentions a number of uses for mica and speaks at length about its properties but if it is a useful dry lubricant when finely ground, the article does not tell us.  —Preceding unsigned comment added by 69.41.40.21 (talk) 18:57, 29 August 2010 (UTC)
thread_title:  use as a dry lubricant? 

message: The formula for mica in English seems incorrect. It seems the formula is double the amount it should be as compared to the articles in other languages, as well as compared to the specific mica formulas found in English articles like biotite, muscovite, etc. Could someone with knowledge in this subject please update this, as I am not expert enough, and don't want to change things that are so specifically sourced (although source from 1966, and not internet accessible could use an update anyway)
English:
X2 Y4–6 Z8 O20(OH,F)4 
German:
D G2,3 [T4 O10] X2
French: 
A C2-3 T4 O10 X2
Dutch: 
(AB2-3X,Si)4 O10(O,F,OH)2
Not really bothered to make all subscripts appear as subscripts (just visit the different pages yourself if they confuse here) 217.122.71.201 (talk) 18:23, 24 August 2014 (UTC)
thread_title:  wrong formula 

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thread_title:  External links modified 

message: How can this be and in the next paragraph China doesn't even appear on the list of major producers?
Gjxj (talk) 13:25, 18 November 2019 (UTC)
thread_title:  China was the top producer of mica with almost a third of the global share 

message: Sheet mica was one of the products of forced labour at this establishment. As the place has its own article, details of the workers and the production methods there are off topic in this article dealing with the mineral itself. I propose deletion. --AntientNestor (talk) 08:43, 1 September 2022 (UTC)
replies: text: It's done. Thanking the IP contributor.--AntientNestor (talk) 06:10, 4 September 2022 (UTC)
thread_title:  [[Theresienstadt Ghetto]]