Talk:Hematite

Untitled
Hematite also has magnetic properties. —Preceding unsigned comment added by 67.99.0.214 (talk • contribs)


 * But it's much more prominant with Magnetite. --DanielCD 18:23, 16 March 2006 (UTC)

hematite and rust
What is the difference between hematite and rust? —Preceding unsigned comment added by Archuro (talk • contribs)

Nothing really. Hematite the pretty mineral is more massive and crystalline. The crystals can form when the mineral is precipitated from liquid. When it forms chemically on iron, that's when you get the red, powdery version. No large crystals form there (only tiny ones). --DanielCD 18:13, 16 March 2006 (UTC)


 * So hematite can't rust? An acquaintance of mine was interested in using some as part of an outdoor sculpture, but was concerned about rust.
 * * Septegram * Talk * Contributions * 05:28, 19 March 2007 (UTC)

I thought most rust was actually various hydroxides of iron, for instance Goethite. See Wikipedia article on "rust".

Also... I've always told my students that the "Hema" in Hematite meant "blood" in Greek, but I actually went and looked it up tonight (funny story to tell, later). According to the English-Greek dictionary at:

http://www.kypros.org/cgi-bin/lexicon

blood = αίμα, αφαιμάσσω aima, afaimasso

in both modern and ancient greek. "Hema" or "Heme" didn't come up with anything. It doesn't seem to be latin, either.

Also.. the Wikipedia article for "hemoglobin" says that the name comes from the "Heme group", and does not mention anything to do with ancient Greek for blood.

OK, the funny story. And the reason I looked this up. Was on the train yesterday (in Kuala Lumpur), and standing in front of me were two Indian schoolgirls, in uniforms and name tags. Name tags read "Hema" and "Vino" (probably short for somethings else). I was very amused by the fact that, there, in front of me, stood "Blood" and "Wine". I didn't say anything to them, of course..

So as you can see, this spoils not only a good joke, but a great story I use in those mineralogy lectures...

60.50.125.67 16:20, 1 April 2006 (UTC)Iskandar

Ah, what a difference a half hour makes.. I can see now that "aima" = "hema" once you've run it through an interlanguage corruption filter...

60.50.125.67 17:06, 1 April 2006 (UTC)Iskandar


 * Yep. You left out the spiritus asper mark, which makes it haima, not aima, then Latin spells the diphthong ae instead of ai, and then you get the British spelling haem-. The American spelling hem- is a simplification that reflects modern pronunciation. —Keenan Pepper 22:38, 14 July 2006 (UTC)

jewelry
It would be nice to see a bit of an addition that describes the jewelry process. I heard that most jewelry out there is manufactured hematite. I've heard the name "hemalyke" but can't confirm what it is. -- Sy / (talk) 17:17, 24 May 2006 (UTC)

Por que? Mi foto no esta includo sor el pagina de hematite? No es si buen por eres sor el pagina? Esta tus empiro? No soy muy contenta con Vsmith! Innovati 02:20, 19 June 2006 (UTC)


 * I believe this is the English Wikipedia. Now my high school Spanish was a long time ago, so I'm not sure just what you are saying. It seems to me that a cartoonized posed photo of what appears to be a zonked out pseudo-hippie staring at his finger doesn't really fit here. The dude doesn't look like a hippie to me. I get the feeling that it is a vanity photo (whee, I'm on Wikipedia!). Anyway it seems that a close-up photo of some polished hematite jewelry would be more fitting. Vsmith 03:04, 19 June 2006 (UTC)


 * I don't know that I believe hematite is only used in precious jewelry, due to its fragility - stores sell hematite rings for less than $3. —Preceding unsigned comment added by Iglidante (talk • contribs) 21:14, 30 January 2009 (UTC)


 * Well well well, it's been a while since I took spanish too, just in case you tried to put it through a translator. Well, not only is that photo *not* of me, but it is also not posed, despite the excellent photography.  I have a series of that kiss, and this is but one of the shots.


 * I hope you will come to enjoy the non-scietific properties of Hematite, the spiritual side of the stone. Perhaps this is not your thing, but that doesn't mean that it shouldn't be included on the article as a reference for those who do care to find out.Innovati

I think that since wikipedia is about information, we shouldn't restrict what may be useful to others because we have little interest in it ourselves. Should we delete pages on things like Hilary Duff, only because we don't like them when they could be informative to others? That doesn't sound like freedom of information to me - unless something is non-factual, I don't see a personal bias as being strong enough to merit deletion. You have to give more of a reason than that, or maybe this isn't the place for you and perhaps you've misunderstood the point. This isn't any one person's web page, everybody is equal and everybody's information should have equal opurtunity. Oh, and use the talk page, not the histroy page in the comments to ask about or justify why something should be changed before removing existing content.Innovati

Removed again, looks like vanity photo - even if it's vanity about your own photo. If it were to be useful here, an image should at least focus on the hematite jewelry rather than what appears to be a pose of a drugged out pseudo-hippie. Vsmith 01:09, 12 August 2006 (UTC)

Wording/reference missing?
Does this line seem a bit inappropriately worded as well as unreferenced to anyone else: "Many hippies today still wear this stone as a regular part of their wardrobe." ??? Pledger166 01:00, 17 January 2007 (UTC)

Colors
What causes the different colors? Why are some forms shiny and some matte red? —Keenan Pepper 22:39, 14 July 2006 (UTC)

Hematite in popular culture
Apparently the magnetic toys, sold under names such as 'oidz', 'uberorbs' and others, are made of hematite, was gonna add a few words about this into the pop culture section but could only find the following reference on play.com and wasnt sure if it counts as a real reference or not (yes im a n00b, no biting plz): http://www.play.com/Gadgets/Gadgets/4-/852389/Oidz/Product.html. I'll add the bit to the article in a few days if no-one objects or offers and advice etc Pledger166 02:39, 16 January 2007 (UTC)


 * A sales pitch by a commercial adv site is hardly a valid reference. Hematite is not a metal as the site states, but an iron oxide mineral with limited magnetic properties. Vsmith 01:32, 17 January 2007 (UTC)


 * I agree that the reference is rubbish that's why i queried the fact in here first, i wont claim to know too much about hematite, thats how i looked at this page in the first place, however there does seem to be a vast amount of mentions to these toys being made from hematite, simply type hematite and oidz into google and u'll get more than a thousand hits, there also seems to be a fair bit more info suggesting the magnetic proporties of hematite, as previously suggested by some one else at the top of this page, if anyone knows more about this, information would be gladly recieved. Pledger166 02:13, 17 January 2007 (UTC)


 * Does anyone know about the song by MC Hammer where he says "Hematite" and then music plays?74.67.228.2 03:33, 17 May 2007 (UTC)
 * He's actually saying "Hammer time" and then does the little foot wiggle dance. --Rocksanddirt 15:34, 31 July 2007 (UTC)

Ishpeming High School in the UP of Michigan uses "Hematites" as a nickname. Worth an add? —Preceding unsigned comment added by 209.173.211.254 (talk) 21:22, 31 January 2008 (UTC)

Correct Spelling
The spelling hematite should be used in all scientific publications. The International Mineralogical Association (IMA) discredited the British spelling, Haematite, in 1980. Mineralogical Magazine vol. 43 (1980) page 1053. Diamonddavej 23:27, 15 March 2007 (UTC)
 * It is the agreed spelling and not the "correct" spelling.
 * The British spelling was rejected not discredited.

Images
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)


 * Thank you for commenting that. It would be valuable information to have the scale. The volunteers who have uploaded the images may not have been aware of this question, or may not have known the scale. However, I think that even without it the pictures offer a lot. Best regards Rhanyeia  11:39, 16 August 2007 (UTC)


 * Well if they did not know to include such basic information they should not have uploaded them. This is a reflection of a fundamental weakness with Wikipedia: contributors do not need to have any understanding on the subjects to which they contribute. —The preceding unsigned comment was added by Special:Contributions/ (talk)
 * Pictures are useful even without a scale bar, as they provide information about morphology, etc. Wikipeida is not a scientific source.  Including accurate scale bars can be a difficult proposition, especially when presented with an uncalibrated microscope or taking a picture of a handsample.  IMHO pictures without scale bars are useful, although scale bars would be nicer to have.  If you have pictures (with scale bars) that you would like to contribute, please do so! (Otherwise STFU?) 130.39.191.251 (talk) 22:41, 13 May 2009 (UTC)


 * Size information has now been added to some mineral articles, and instruction pages have been improved so that future picture uploaders would know. Best regards Rhanyeia  10:29, 21 August 2007 (UTC)

Something missing?
"Good specimens of hematite come from England, Mexico, Brazil, Australia and the Lake Superior region of the United States and Canada. If there are no good hematite specimens in the Grand Canyon then what are all those red rocks about? Plse. add.71.236.23.111 (talk) 07:30, 20 May 2008 (UTC)
 * That's all colloidal hematite. Most rock collectors do not consider it a good specimen form. --Kent G. Budge (talk) 22:57, 18 December 2020 (UTC)

6th graders who needs help on the homework
tell if the rock is igneous metamorphic or sedimentary —Preceding unsigned comment added by 66.61.101.181 (talk) 02:59, 21 November 2008 (UTC)

Hematite is not a rock, it's a mineral —Preceding unsigned comment added by 130.102.0.175 (talk) 03:16, 15 May 2009 (UTC)

And rocks are made up of minerals. — Preceding unsigned comment added by Primrose49 (talk • contribs) 07:52, 11 July 2016 (UTC)


 * It's too late to ask the 6th grader whether they really wanted to know what kinds of rocks hematite is found in; but this article could certainly use more on its natural occurrence. I don't think we could do much to make this article accessible to grade 6 students, though. RockMagnetist(talk) 20:11, 11 July 2016 (UTC)

Radix point usage.
Why does this article use the "." to separate the thousands group in "80.000" years when the decimal point is also used for radix point in items like "Specific gravity 	4.9 - 5.3"

Just thought it was inconsistent. —Preceding unsigned comment added by 24.78.194.108 (talk) 03:55, 1 July 2009 (UTC)
 * Looks like some glitch in tidying software. Fixed. Thanks. Materialscientist (talk) 04:06, 1 July 2009 (UTC)

Egyptian "booby trap"
I've removed the following from the article as trivial here, it may belong in some Egyptian archaeology article or somewhere. Vsmith (talk) 17:06, 7 December 2010 (UTC)


 * ===Ancient Egyptian booby trap===
 * In 2001, Egyptian government archaeologist Zahi Hawass was the first to enter a previously undisturbed tomb, believed to be that of an ancient regional mayor, in the Bahariya Oasis below the town of Bawiti. Upon entering the burial chamber, Hawass discovered a booby trap consisting of 8 inches of finely powdered hematite dust covering the floor and sarcophagus. When disturbed by a tomb robber, the sharp, metallic dust was intended to become airborne and irritate the skin, eyes and mucous membranes, eventually causing lethal siderosis if exposed for long enough. The archaeological team was forced to retreat and don full body suits and respirators in order to confirm the identity of the mummy. Hawass cites the ancient Egyptians' experience with powdered hematite as a paint pigment as proof that they were aware of its irritating properties.

For what it's worth, I came to Wikipedia looking for this and had to go back to Google to find the talk page.76.219.166.52 (talk) —Preceding undated comment added 03:38, 23 November 2016 (UTC)

shiny
This article has lots of shiny metalic images (particularly the jewelry), which look like sections of polished metalic (fairly pure) iron. Does polishing (or some other treatment) reduce the surface layer to metalic iron? Or does the oxide itself have a grey metallic allotrope? Or perhaps cynically (but with relevance to the accuracy of the article), does hematite jewelry refer simply to jewelry made from the lumps of metallic iron that can be commonly found amongst rocks that are otherwise mostly composed of hematite? Cesiumfrog (talk) 02:26, 4 March 2012 (UTC)
 * Err... only see one "shiny" image, the bear. The color varies as the article notes and shiny gray "specular" hematite is one variety. "Lumps of metallic iron" would be very unusual with hematite as a quite different redox environment is required. Am quite skeptical of "hematite" jewelry ... but don't know much about such. Vsmith (talk) 03:18, 4 March 2012 (UTC)
 * An abstract note: both the refractive index and absorption are high for hematite in the visible range, meaning its smooth surfaces must be shiny without a need for metallic iron. Materialscientist (talk) 03:26, 4 March 2012 (UTC)

SI units please !
Can someone please convert the info on unit cell dimensions to SI units ? — Preceding unsigned comment added by 82.37.54.83 (talk) 16:35, 18 October 2016 (UTC)
 * ✅ RockMagnetist(talk) 18:11, 18 October 2016 (UTC)

Luogufengite
Not only maghemite is another polymorph of Fe2O3 in the nature. Luogufengite is Fe2O3, too. Eudialytos (talk) 12:34, 18 June 2017 (UTC)

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Magnetism?
Hematite is an antiferromagnetic material below the Morin transition at 250 K (−23 °C), and a canted antiferromagnet or weakly ferromagnetic above the Morin transition and below its Néel temperature at 948 K (675 °C), above which it is paramagnetic. ''The magnetic structure of α-hematite was the subject of considerable discussion and debate during the 1950s, as it appeared to be ferromagnetic with a Curie temperature of approximately 1,000 K (730 °C), but with an extremely small magnetic moment (0.002 µB). Adding to the surprise was a transition with a decrease in temperature at around 260 K (−13 °C) to a phase with no net magnetic moment. It was shown that the system is essentially antiferromagnetic, but that the low symmetry of the cation sites allows spin–orbit coupling to cause canting of the moments ...'' etc.

Two and a half screens of this technical gobbledygook, and nowhere in it do I find the one thing the average consultor of an encyclopedia is probably looking for: will raw hematite stick to a magnet or not?  — Preceding unsigned comment added by 74.95.43.253 (talk) 02:57, 29 May 2020 (UTC)


 * "Hematite is an antiferromagnetic material ..."  No.
 * If you think the term "antiferromagnetic" is unfamiliar enough to need a very brief explanation (antiferromagnetics are insensitive to magnetic fields) it might not be unreasonable to put that in. --Kent G. Budge (talk) 22:55, 18 December 2020 (UTC)

Magnetation?
Is this being given undue weight? It seems that very little hematite is mined by this method, and the company has actually filed for Chapter 11 bankruptcy. --Kent G. Budge (talk) 23:01, 18 December 2020 (UTC)