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
My coder is trying to convince me to move to .net from PHP. I have always disliked the idea because of the costs. But he's tryiong none the less. I've been using Movable-type on several websites for about a year and am anxious about switching to another platform. I have heard excellent things about blogengine.net. Is there a way I can transfer all my wordpress content into it? Any help would be really appreciated! hamster till salu wacons.teswomango.com/map9.php
filippa k sneakers herr
(filippa k sneakers herr, 14. 11. 2021 6:26)
Hey! I'm at work surfing around your blog from my new apple iphone! Just wanted to say I love reading your blog and look forward to all your posts! Keep up the fantastic work! filippa k sneakers herr rodef.prizsewoman.com/map19.php
scholl skor återförsäljare malmö
(scholl skor återförsäljare malmö, 13. 11. 2021 21:20)
Very good article. I am experiencing some of these issues as well.. scholl skor återförsäljare malmö slipol.sewomabest.com/map20.php
mat vid gallsten
(mat vid gallsten, 13. 11. 2021 8:26)
Very nice post. I certainly love this website. Thanks! mat vid gallsten poka.sewomabest.com/map16.php
vw begagnade bilar
(vw begagnade bilar, 12. 11. 2021 23:50)
If some one needs to be updated with hottest technologies then he must be pay a quick visit this web site and be up to date daily. vw begagnade bilar july.prizsewoman.com/map15.php
svamp i huden naturmedicin
(svamp i huden naturmedicin, 12. 11. 2021 14:48)
What's up to every one, the contents present at this site are in fact amazing for people experience, well, keep up the nice work fellows. svamp i huden naturmedicin labco.teswomango.com/map21.php
smart glas pris
(smart glas pris, 11. 11. 2021 14:25)
It's awesome for me to have a website, which is useful designed for my knowledge. thanks admin smart glas pris retly.teswomango.com/map3.php
infekterat sår finger
(infekterat sår finger, 11. 11. 2021 5:25)
I know this if off topic but I'm looking into starting my own blog and was curious what all is required to get setup? I'm assuming having a blog like yours would cost a pretty penny? I'm not very web savvy so I'm not 100% certain. Any recommendations or advice would be greatly appreciated. Thanks infekterat sår finger tracal.teswomango.com/map4.php
cialis 20 mg cialiswithdapoxetine.com
(MichaelFah, 11. 11. 2021 5:18)cialis price https://cialiswithdapoxetine.com/# - cialis tadalafil & dapoxetine
relax stockholm billigt
(relax stockholm billigt, 10. 11. 2021 20:54)
It's not my first time to pay a quick visit this web page, i am visiting this site dailly and get pleasant data from here every day. relax stockholm billigt ucpit.sewomabest.com/map22.php
real techniques flawless face brush
(real techniques flawless face brush, 10. 11. 2021 9:29)
I all the time emailed this web site post page to all my friends, since if like to read it afterward my contacts will too. real techniques flawless face brush trisal.prizsewoman.com/map7.php
vad ska man äta vid järnbrist
(vad ska man äta vid järnbrist, 9. 11. 2021 2:14)
This is really interesting, You're an overly skilled blogger. I have joined your rss feed and look forward to in quest of more of your excellent post. Also, I have shared your web site in my social networks vad ska man äta vid järnbrist distco.teswomango.com/map21.php
shopping luleå öppettider
(shopping luleå öppettider, 8. 11. 2021 17:33)
It's awesome to visit this website and reading the views of all colleagues regarding this article, while I am also zealous of getting familiarity. shopping luleå öppettider borhoo.sewomabest.com/map17.php
fogsand xl bygg
(fogsand xl bygg, 8. 11. 2021 8:31)
Hi there, just became aware of your blog through Google, and found that it is really informative. I am gonna watch out for brussels. I'll be grateful if you continue this in future. Lots of people will be benefited from your writing. Cheers! fogsand xl bygg jado.teswomango.com/map14.php
bare minerals cc cream
(bare minerals cc cream, 7. 11. 2021 23:38)
Today, I went to the beachfront with my kids. I found a sea shell and gave it to my 4 year old daughter and said "You can hear the ocean if you put this to your ear." She put the shell to her ear and screamed. There was a hermit crab inside and it pinched her ear. She never wants to go back! LoL I know this is entirely off topic but I had to tell someone! bare minerals cc cream tercon.prizsewoman.com/map6.php
lchf ont i huvudet
(lchf ont i huvudet, 7. 11. 2021 14:35)
My partner and I absolutely love your blog and find a lot of your post's to be just what I'm looking for. Do you offer guest writers to write content for yourself? I wouldn't mind writing a post or elaborating on some of the subjects you write regarding here. Again, awesome blog! lchf ont i huvudet gutfm.prizsewoman.com/map6.php
klassiska klänningar online
(klassiska klänningar online, 7. 11. 2021 5:46)
Hello! I know this is kind of off topic but I was wondering which blog platform are you using for this website? I'm getting fed up of Wordpress because I've had issues with hackers and I'm looking at alternatives for another platform. I would be fantastic if you could point me in the direction of a good platform. klassiska klänningar online rodef.prizsewoman.com/map1.php
kalla blomma betydelse
(kalla blomma betydelse, 6. 11. 2021 21:04)
I every time used to read article in news papers but now as I am a user of web therefore from now I am using net for articles, thanks to web. kalla blomma betydelse bewood.sewomabest.com/map29.php
pannbiff med fetaost recept
(pannbiff med fetaost recept, 6. 11. 2021 12:10)
Currently it seems like Movable Type is the top blogging platform out there right now. (from what I've read) Is that what you're using on your blog? pannbiff med fetaost recept asan.prizsewoman.com/map17.php
korta tighta klänningar
(korta tighta klänningar, 5. 11. 2021 18:45)
Hi there! Do you know if they make any plugins to protect against hackers? I'm kinda paranoid about losing everything I've worked hard on. Any recommendations? korta tighta klänningar charsa.sewomabest.com/map8.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
hamster till salu
(hamster till salu, 15. 11. 2021 10:35)