Hematit
Hematit, chemický vzorec Fe2O3 (oxid železitý), je klencový minerál.
Název hematit je řeckého původu, haĩma - αιματoεις (krev) přes latinské haema a vystihuje barvu minerálu. Starší český název je krevel.
Obsah[skrýt] |
Vznik
Původ magmatický, hydrotemální (střední a nižší teploty), metamorfní i sedimentární (vysrážením z mořské vody).
Morfologie
Nejčastěji v zrnitých až celistvých, paprsčitě vláknitých až zemitých agregátech, složený z oválných útvarů velikosti hrachu až máku. Méně často v hrubě krystalických agregátech nebo šupinatý. Krystaly jsou vzácné, mají tvar šupinek, tabulek, romboedrů, často dvojčatí.
Vlastnosti
- Fyzikální vlastnosti: Tvrdost 5-6 (zemité formy i 1), hustota 5,2 g/cm³, neštěpný – odlučnost je podmíněna dvojčatěním podle {0001}, lom lasturnatý, křehký. Slabě magnetický.
- Optické vlastnosti: Barva: červená, hnědá, šedá až černá, lesk kovový, matný, průhlednost: průsvitný až opaktní, vryp višňově červený, červenohnědý.
- Chemické vlastnosti: Složení: Fe 69,94 %, O 30,06 %, příměsi Ti často až do 9 %, Mn, Al. Rozpustný v koncentrované HCl. Před dmuchavkou se netaví. Žíháním v oxidačním plameni se mění v magnetit.
Odrůdy
- spekularit
- hematitová růže
Podobné minerály
goethit, limonit, pyrofanit, ilmenit, magnetit, chromit
Získávání
Hematit se těží v povrchových dolech za pomoci těžké techniky.
Využití
Důležitá ruda železa, čistý obsahuje až 70 % železa. Jemnozrnný zemitý a mletý se používá jako barvivo (rudka) nebo lešticí prášek. Někdy jako ozdobný a drahý kámen (fasetové brusy, kabošony, gemy).
Naleziště
Hojný minerál.
- Česko – Narysov, Horní Blatná, Hradiště
- Slovensko – Rudňany, Rožňava
- Švédsko – Striberg, Norberg, Blötberg
- Ukrajina – Krivoj Rog
- Rusko – Kursk
- Brazílie – Matto Grosso
- a další.
Komentáře
Přehled komentářů
Hi colleagues, nice paragraph and good arguments commented at this place, I am truly enjoying by these. blödning i ändtarmen tara.sewomabest.com/map7.php
marsipanöverdrag till tårta
(marsipanöverdrag till tårta, 11. 8. 2021 5:10)
Greetings I am so thrilled I found your web site, I really found you by error, while I was researching on Google for something else, Anyhow I am here now and would just like to say many thanks for a incredible post and a all round exciting blog (I also love the theme/design), I don’t have time to read through it all at the moment but I have saved it and also included your RSS feeds, so when I have time I will be back to read a lot more, Please do keep up the superb jo. marsipanöverdrag till tårta myre.sewomabest.com/map16.php
spis sundt og tab dig
(spis sundt og tab dig, 10. 8. 2021 21:24)
Great article. I'm going through a few of these issues as well.. spis sundt og tab dig deista.teswomango.com/map3.php
ecco skor dam vinter
(ecco skor dam vinter, 10. 8. 2021 10:41)
Hello, i think that i saw you visited my blog so i came to “return the favor”.I'm trying to find things to improve my web site!I suppose its ok to use a few of your ideas!! ecco skor dam vinter gero.prizsewoman.com/map11.php
skinnjacka mc modell
(skinnjacka mc modell, 10. 8. 2021 2:10)
Excellent way of telling, and pleasant piece of writing to obtain facts regarding my presentation focus, which i am going to deliver in university. skinnjacka mc modell dexmi.sewomabest.com/map2.php
alfred nordqvist kaffe
(alfred nordqvist kaffe, 9. 8. 2021 17:19)
We're a bunch of volunteers and opening a new scheme in our community. Your web site provided us with useful information to work on. You've done a formidable process and our whole neighborhood can be grateful to you. alfred nordqvist kaffe fiudi.sewomabest.com/map4.php
förenade arabemiraten fakta
(förenade arabemiraten fakta, 9. 8. 2021 8:15)
An intriguing discussion is worth comment. I believe that you ought to publish more on this topic, it might not be a taboo matter but generally folks don't talk about these topics. To the next! Cheers!! förenade arabemiraten fakta centgr.teswomango.com/map27.php
fransk manikyr set
(fransk manikyr set, 9. 8. 2021 0:25)
Amazing! Its genuinely amazing paragraph, I have got much clear idea about from this paragraph. fransk manikyr set longp.prizsewoman.com/map16.php
kitchenaid diamond blender prisjakt
(kitchenaid diamond blender prisjakt, 8. 8. 2021 14:14)
Hi there, after reading this awesome post i am also cheerful to share my experience here with mates. kitchenaid diamond blender prisjakt genso.teswomango.com/map2.php
förslag till text på kondoleans
(förslag till text på kondoleans, 8. 8. 2021 6:18)
I know this web site presents quality dependent posts and additional stuff, is there any other web page which provides these kinds of information in quality? förslag till text på kondoleans loccc.prizsewoman.com/map16.php
grekiskt och gott
(grekiskt och gott, 7. 8. 2021 22:38)
It's appropriate time to make some plans for the future and it's time to be happy. I've read this post and if I could I desire to suggest you few interesting things or suggestions. Perhaps you can write next articles referring to this article. I want to read more things about it! grekiskt och gott cetot.prizsewoman.com/map26.php
smoothie selleri avokado
(smoothie selleri avokado, 7. 8. 2021 12:32)
I am curious to find out what blog system you are working with? I'm experiencing some small security problems with my latest site and I would like to find something more secure. Do you have any suggestions? smoothie selleri avokado prept.teswomango.com/map3.php
klimakteriet vilken ålder
(klimakteriet vilken ålder, 7. 8. 2021 3:47)
I'm really loving the theme/design of your website. Do you ever run into any web browser compatibility problems? A couple of my blog readers have complained about my site not operating correctly in Explorer but looks great in Chrome. Do you have any advice to help fix this problem? klimakteriet vilken ålder tersra.prizsewoman.com/map24.php
monster high sängar
(monster high sängar, 6. 8. 2021 16:38)
We're a bunch of volunteers and opening a brand new scheme in our community. Your site offered us with valuable info to work on. You have done an impressive activity and our entire group might be thankful to you. monster high sängar liici.teswomango.com/map21.php
svider i svalget
(svider i svalget, 6. 8. 2021 7:42)
Fine way of describing, and good post to obtain information regarding my presentation subject matter, which i am going to deliver in institution of higher education. svider i svalget tingza.prizsewoman.com/map25.php
mörk sirap innehåll
(mörk sirap innehåll, 5. 8. 2021 23:43)
WOW just what I was searching for. Came here by searching for
Excellent article. Keep posting such kind of information on your blog. Im really impressed by your blog.
Hi there, You have done a fantastic job. I'll certainly digg it and for my part suggest to my friends. I am sure they will be benefited from this web site. mörk sirap innehåll dintvo.sewomabest.com/map10.php
chokladpaj med digestivebotten
(chokladpaj med digestivebotten, 5. 8. 2021 13:18)
I don't even understand how I ended up here, however I assumed this post was great. I don't recognize who you're however definitely you're going to a well-known blogger for those who are not already. Cheers! chokladpaj med digestivebotten diacle.teswomango.com/map24.php
depend höst 2016
(depend höst 2016, 5. 8. 2021 5:01)
Thank you for the good writeup. It in fact was a amusement account it. Look advanced to more added agreeable from you! By the way, how can we communicate? depend höst 2016 etslid.teswomango.com/map1.php
Almost all goods from China are of poor quality: truth or fiction?
(Kanteffib, 4. 8. 2021 23:19)
Many people have a stereotype in their heads about the low quality of Chinese goods and their short service life. But despite this, all the store shelves are filled with goods from this country, whether it is clothing, appliances or even cars. Let's see what category of quality Chinese goods actually belong to.
Is it true that China produces everything?
According to statistics, every item number five is produced in the "Middle Kingdom". It is not surprising, because there are many factories and industries in the country. The question is, what is China not yet engaged in the production of?
Production of goods in China
Now even operating systems and nuclear reactors, Beijing has put on production. Of course, something is still being purchased from other countries, but the active growth in production is visible to the naked eye.
What has China succeeded most in?
It is obvious that in clothing, shoes and other consumer goods.
Automated shoe sewing lines
Further, the figures are really striking in their scale - 70% of smartphones, 60% of construction materials, 90% of computers and components, and so on, are produced in China. The following areas are also developing - metallurgy, mechanical engineering and shipbuilding, well, it has been known for a long time about Beijing's actively developing program for space exploration. Even the robots beloved by Japan and Korea, China has recently been doing more.
Which companies from the West produce their goods in China?
It is easier to list those who do not produce their goods in this country, because companies such as Apple, Microsoft, Sony, Adidas, Nike, Gucci, Colgate, Nivea and many others have long found in China the main manufacturer of their goods.
Assembly conveyor line at a Chinese factory
There are explanations for this, one of them is the opportunity to open and launch your production according to a ready-made scheme in a very short time and with low costs.
What about cars?
The time when cars from China were like test cars has passed. Now this industry is growing very rapidly, and with it the quality of cars. Now the Chinese car industry is in no way inferior to other manufacturers in comparable classes.
Chinese cars HAVAL
On the roads of any Russian city, you can find a lot of Chinese-made cars, and such popularity indicates the availability and reliability of these cars.
To sum up: is China about quality or not?
Of course, it is impossible to say unequivocally what the quality of the purchased thing will be, because China produces almost all types of goods and does it in huge volumes, but who and under what conditions produces this or that product is another question.
Tag on clothing made in China
A popular myth in our country about low-quality goods with the inscription "Made in China" appeared in the 1990s, it was then that cheap Chinese consumer goods began to appear on the markets of Russia and Europe. Now, serious and high quality control has been established at the factories of China. Any doubts of the quality control department about the product, send the products for reworking. And the success of Chinese companies in the field of mobile development suggests that a lot of attention is paid to the quality of products.
On the website https://china-bazar.com you can order any product from China at an affordable price.
världens snabbaste internet
(världens snabbaste internet, 4. 8. 2021 20:55)
I have to thank you for the efforts you've put in writing this blog. I'm hoping to check out the same high-grade blog posts from you in the future as well. In fact, your creative writing abilities has inspired me to get my own blog now ;) världens snabbaste internet icta.prizsewoman.com/map9.php
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58

blödning i ändtarmen
(blödning i ändtarmen, 11. 8. 2021 13:14)