Talk:Garnet

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This article was the subject of a Wiki Education Foundation-supported course assignment, between 13 January 2020 and 1 May 2020. Further details are available on the course page. Student editor(s): Bakerme2. Peer reviewers: Tmahseredjian, BZenith.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 22:03, 16 January 2022 (UTC)

Commercial advertising pages on Wikipedia

I am basically going through and eliminating pages of commercial sites which have been appended onto mineral Wikipedia pages to pull viewers off Wikipedia. Yes indeed, they have a partial page or so of standard mineralogical data or other basic information - nothing new or unusual, simple textbook stuff easily available. Then with their bit of info, they have a whole bunch of ad links, product offering links and other links intended to pull users and add Google PageRank to their sites. This is a commercial use of Wikipedia for advertising purposes, which is not allowed. In spite of having a little bit of data, these links fall under the definition of spam. Almost all these same Wiki pages also have a link to mindat.org - a non commercial site with exactly the same basic mineralogical info. Many of the Wikipedia pages themselves have just as much info as the ad/spam pages. - Chris

Retrieved from "http://en.wikipedia.org/wiki/User_talk:Reno_Chris"

Groups

Are the groups at http://www.mineralminers.com/html/garminfo.htm correct? If so, I'll put the garnet groups into those subgroups. Pyralspite garnet redirects here, and though we never use the term, the three members of that group are covered here of course. If that link is correct, can someone fix this article to reflect the grouping, or let me know and I will? Same for Ugrandite garnet. Both of these come from the info at scienceworld.wolfram.com. Thanks - Taxman ^Talk 18:50, August 25, 2005 (UTC)

Looked good to me - so I did it :-). Check it over for glitches. Do need to redo the reference section now, tho' I added Mineral miners link. Probably could expand the garnet structure as a separate section. Vsmith 00:47, 26 August 2005 (UTC)

AB or XY?

Is there any reason to substitute AB for the positions with X and Y? In Germany, the positions in lattices of this type are traditionally referred to as A and B, but I don't know how this is in the English speaking world.Cato82 21:18, 4 September 2006 (UTC)

Only to avoid some confusion, after anon editors replaced the A with Al on at least two occasions I thought X and Y might be more generic appearing and less prone to confusion by the average reader/editor. I would have no objections to putting it back to A - B. Vsmith 23:25, 4 September 2006 (UTC)

If so, add both conventions then? -- Ktsquare (talk) 02:47, 16 January 2022 (UTC)

Color Description

At one point this page describes pyrope garnets as being "ruby-red" in color. Red garnets are a deeper red than rubies (making it look darker). I'm not trying to be nitpicky but all that description does is fuel people who think garnets and rubies are the same thing (as someone born in January I beg to differ). Lollipop09 01:59, 23 January 2007 (UTC)

Sorry, I went to the article and changed it to just "red" myself. Garnets and rubies are still not the same thing. Lollipop09 01:25, 24 January 2007 (UTC)

Variety vs. Species

This article uses the term variety (mostly) when talking about the different types of garnet group minerals. In actuality it would be more correct to differentiate between the species of garnet (andradite, spessartine, grossular, etc) from the varieties of the species of garnet (hessonite, melonite, etc) as there is a significant difference between the two groups see www.mindat.org for the specifics of the different species, their relationships, and the correct current names (almandine not almandite, spessartine a=not spessatite, etc...) Kevmin 01:53, 26 February 2007 (UTC)

Infobox Color

I have looked through both Wikiprojects, Gemology and Jewelry; Rock and Minerals, and have found no consensus for a specific color for the infoboxes. At this point the large majority of Mineral articles that have infoboxes use the default ?lilac? purple. At the same time the Gem articles are rather sporadic and seem to follow the color of the Gem in question. I would suggest having a discussion regarding a specific color for all mineral articles, but seeing as how the R&M group is not very active, I think I'm about the only one that is doing anything, It is probably best for the G&J project to take the initiative for standardization. In the interim I shall change alternate color boxes back to default in preparation for an end result. (also cross posted to both projects talk pages --Kevmin 22:35, 18 September 2007 (UTC)

This page should be merged with the Hungarian equivalent Gránátcsoport: http://hu.wikipedia.org/wiki/Gr%C3%A1n%C3%A1tcsoport —Preceding unsigned comment added by 87.242.44.44 (talk) 22:03, 11 December 2007 (UTC)

Dispersion

The gemological tables or details per species should indicate the R.I. for each species and the dispersion values. Demantoid/Andraite is noted for it's .057 dispersion. Dispersion being the refractive index difference between a red (Fraunhofer A) photon and a blue (Fraunhofer G) photon I'll let others more competent than I edit this into the page. -John LeB. —Preceding unsigned comment added by 70.171.243.168 (talk) 17:11, 8 May 2008 (UTC)

Tuesday Birthstone

In the birthday article, Garnet is supposedly the birthstone for Tuesday. I didn't want to put this on the article because it could be called vandalism or something. So if anyone has any facts about it, please put it on the Garnet article. Wikimichael22 (talk) 15:43, 5 June 2008 (UTC)Wikimichael22

"Abrasive garnet" section needs cleanup

Just a heads up if anyone is working on this article: the "abrasive garnet" section could use some trimming for clarity and conciseness, and has nonstandard capitalization. Crystal whacker (talk) 00:17, 26 November 2008 (UTC)

Cleanup is pretty much complete, though I am sure some parts can and should be re-worded. I may continue to work on that in bits and pieces. I removed the cleanup tag, and placed a citations tag, as that entire section does not have a single in-line citation. Theseeker4 (talk) 14:27, 26 November 2008 (UTC)

You did a good job, Theseeker4, and thanks for letting me know about it. I fixed two more minor errors in grammar. The main concern, as you state, is that there is no inline citation at all. The writing is also of medium quality: it starts by distinguishing water jet grade from cutting grade (or whatever it was), but then it talks about various kinds of abrasive garnet and where they are found without clarifying the original distinction further. It doesn't give much context, and reads as if an expert on the subject is trying to communicate with other experts, not with newcomers to the subject. So there's still some way to go. Crystal whacker (talk) 18:09, 26 November 2008 (UTC)

Thanks. I am quite poor at catching my own mistakes at the time I am writing something, so often there will be spelling and/or grammer errors in what I write, but that is why we have multiple editors, lol. I agree with your assessment, and would add that the original author may not have had English as a first language, so some of the distinctions he/she may have been trying to make were probably lost. I tried basically to correct grammer, clarify sentences and correct capitalization/punctuation, without expanding on what is said and without being able to judge the truthfullness of the statements. The entire section may deserve a rewrite, especially to go into more detail about the different uses of the grades, not just the relative quality and merits of the sources. I just corrected what I could in the time available, and will continue to monitor it and possibly add/rewrite as necessary. Theseeker4 (talk) 18:17, 26 November 2008 (UTC)

Mineral vs. Crystal Type

I noticed that the article defines garnets as (X₃Y₂(SiO₄)₃), although there are plenty of known garnets that do not contain silicon. See, for example, S. Geller, C.E. Miller, and R.G Treuting "New Synthetic Garnets" in Acta Crystallographica Vol. 13 Iss. 3 pgs. 179-186 (1960) where 23 types of garnet with general formula X3Y2Ge3O12 are reported. From the point of view of a solid state chemist, silicate garnets are a specific instance of the more general class of chemicals with the formula A3M2X3O12 and the crystal structure described in the article.

My question is should the more general system of garnets be its own article, leaving this one as the mineralogically interesting silicate garnets, or should the "synthetic garnets" section be expanded (and renamed) to fill in the rest of the gaps? The current article is quite nice as it is within its scope, but the "Synthetic Garnet" section feels somewhat out of place in part because it includes chemical structures that contradict the general formula given in the box at the top of the article. More specifically, it sort of feels like this section is a dumping ground for the bits of information don't fit within the scope of the rest of the article.

I am happy to do what is needed once I know what the editors prefer. Thanks JaredAllred (talk) 14:44, 27 July 2009 (UTC)

I agree that there are a variety of synthetic crystals based on the garnet structure which now redirects to garnet. This article should stay focused on the mineralogy and the synthetic garnets should be described in either that or an article titled synthetic garnet as there should be sufficient info available for a separate article. Vsmith (talk) 15:35, 27 July 2009 (UTC)

Ok, I will make a few changes to the "Synthetic Garnet" section to make it fit better with the rest of the article and if I have time I will start a stub for the garnet structure. Thanks JaredAllred (talk) 18:12, 28 July 2009 (UTC)

Inexpertly, generally, garnet has the chemical composition

(M O)₃ C Q₃

where M represents "Mafic" (Fe,Mg;Ca), C represents "Corundum" (Al₂O₃), and Q represents "Quartz" (SiO₂). I.e. garnet is an "alloy" or amalgamation of Mafic-oxides, Aluminum-oxides, and Quartz (sand). 66.235.38.214 (talk) 06:41, 11 October 2012 (UTC)

From (X₃Y₂(SiO₄)₃) (garnet group) to (X₃Z₂(TO₄)₃), where (X = Ca, Fe, etc. , Z = Al, Cr, etc. , T = Si, As, V, Al, Fe³⁺, Te, etc.) (garnet structural group). Examples: berzeliite, bitikleite-(SnAl), bitikleite-(SnFe), bitikleite-(ZrFe), kerimasite, kimzeyite, morimotoite, palenzonaite, schäferite, schorlomite, toturite, yafsoanite. --Chris.urs-o (talk) 15:26, 11 October 2012 (UTC)

I'm grateful for the informative links. I can clearly comprehend the symbolic similarities M → X, C → Y,Z. However, the T group seems confusing; are there obvious reasons why elements, seemingly scattered across the Periodic table, from different groups & different periods, would all be able to mimic Si ? 66.235.38.214 (talk) 11:59, 12 October 2012 (UTC)

(SiO
₄)⁴⁻
₃, (VO
₄)³⁻
₃, (Fe³⁺
O
₄)⁵⁻
₃, (AsO
₄)³⁻
₃, (AlO
₄)⁵⁻
₃, (TeO
₆)⁶⁻
₂. It seems that you need 12 Oxygens for the linking with X²⁺
or X³⁺
. --Chris.urs-o (talk) 13:13, 12 October 2012 (UTC)

Inexpertly counting atoms, and trying to bin them into more simplistically comprehensible compounds, I'd like to give two oxygens from (TO₄) to the metal oxides, and liken (TO₂) to quartz (SiO₂). Accordingly, I'd need to think of T as T⁴⁺. Evidently, I'm not comprehending the actual chemical structure of the Garnet group. Are the fundamental structural units SiO
₄, or SiO
₂? Or, are the fundamental units the former, but they link up, sharing oxygens, so that the actual chemical ratio is the latter? 66.235.38.214 (talk) 13:04, 17 October 2012 (UTC)

How about these images. A silicate tetrahedron and an aluminium oxide octahedron. SiO₂ never exists, it's always a silica tetrahedron or Si²⁺
O²⁻
₂ repeating unit.

• 
  Nesosilicate, garnet, grossular [Ca₃Al₂(SiO₄)₃]
• 
  Grossular, structure analysis
• 
  SiO⁴⁻
  ₄ tetrahedron, 0.163-0.165 nm (pyrope, almandine, goldmanite)
• 
  AlO⁹⁻
  ₆ octahedron

File:Grossular-cao8.png - File:Corindon structure cristalline.svg--Chris.urs-o (talk) 14:44, 17 October 2012 (UTC)

Thanks for taking the time to find the pictures. What i understand at present, is that (nearly?) all of the larger garnet-group "T" elements (Si; Al, V, Fe,Te) can form silicon-like quadruply positively charged ions, most even of somewhat similar physical size (60-70pm):

http://www.saylor.org/site/wp-content/uploads/2011/06/Ionic-Radius.pdf

For clarity, although (SiO₂) physically forms tetrahedra, if you count atoms, the ratio of Oxygen-to-Silicon is 2-to-1 (every Oxygen is doubly counted, for two Silicons' tetrahedra). If you have N_Si Silicons; and N_O Oxygens; then every Silicon forms 4 (single) bonds; and every Oxygen forms 2 (single) bonds; and every bond is between a Silicon and an Oxygen; so the total number of bonds made by Silicons equals the total number of bonds made by Oxygens. Thus, 4N_Si = 2N_O, and so there are twice as many Oxygens as Silicons, in the bulk sample. i understand, that the actual chemical ratio of Silicon-to-Oxygen in quartz is 2:1.66.235.38.214 (talk) 16:06, 19 October 2012 (UTC)

Assessment comment

The comment(s) below were originally left at Talk:Garnet/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.

Garnet ranks a high importance article due to it's status a birthstone. It also has numerous subspecies, many of which have notablity. As such the article would receive a high number of page views from this connection.SauliH 06:51, 23 January 2007 (UTC)

Last edited at 07:53, 28 January 2007 (UTC). Substituted at 15:48, 29 April 2016 (UTC)

Semi-protected edit request on 30 October 2016

Only From Sri Lanka.

123.231.124.120 (talk) 10:22, 30 October 2016 (UTC)

 Not done - incorrect - "the main producers today are Australia and India" - Arjayay (talk) 13:10, 30 October 2016 (UTC)

Semi-protected edit request on 15 August 2017

We are in the process of updating the website, please change the external link of gemstone.org to this one: http://gemstone.org/education/gem-by-gem/154-garnet Thank you! ICAgemstone (talk) 15:41, 15 August 2017 (UTC) ICAgemstone (talk) 15:41, 15 August 2017 (UTC)

Done jd22292 (Jalen D. Folf) (talk) 15:45, 15 August 2017 (UTC)

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GARNET USE IN AEROSPACE

Garnet has its uses as an abrasive but it is also used as a counter abrasive in aircraft and aerospace applications. The world's best and hardest garnet comes from the Emerald creek garnet mine in N.Idaho near Fernwood. It is shipped for all applications especially water jet and sandblasting like other sites but is being bought up at an ever increasing rate because of its rarity and finite amount and is becoming more difficult to mine. Their are buyers that are stockpiling it because of this. Its uses in aerospace are for one as a coating on leading wing surfaces by combing it with a polymer. As high speed aircraft pass through the air they encounter fine dust which acts as a sandblaster and eventually erodes leading edges of wing and tail sections. This polymer protects these surfaces as if they are coated with diamond the next hardest stone. The military has other uses as well and has ordered the site to remain operational during the current CCP virus pandemic. Emerald creek also has a public dig site operated by the Forest Service where quality gemstones can be dug for a small fee. It is here where the prized 6 ray specimens can be found in quantity compared to the rest of the world where this type(almandine)is absent or extremely rare.184.63.66.43 (talk) 19:46, 4 April 2020 (UTC)

A Commons file used on this page or its Wikidata item has been nominated for deletion

The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:

• Garnets 1920x1920 cc by nc lina jakaite strike dip com.png

Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 07:51, 29 November 2022 (UTC)

Inconsistencies re garnet production

There is a map of producers which doesn't show America and Australia as producers, but the text says that India and Australia are the main producers. Elsewhere the text says that an American mine is the source of 90% of garnet production (is this an error for 90% of US production? the citation for this is a broken link). Lavateraguy (talk) 15:08, 26 September 2023 (UTC)

Garnet found in Massachusetts

I have found small quantities of it in my homestate Retrosnap (talk) 20:10, 17 July 2024 (UTC)