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
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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.
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