Fitxategi:Iron (Tertiary; Disko Island, Greenland) 2 (17150419318).jpg
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Laburpena
DeskribapenaIron (Tertiary; Disko Island, Greenland) 2 (17150419318).jpg |
Native terrestrial iron from the Tertiary of Greenland. (public display, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA) A mineral is a naturally-occurring, solid, inorganic, crystalline substrance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 4900 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. Elements are fundamental substances of matter - matter that is composed of the same types of atoms. At present, 118 elements are known (four of them are still unnamed). Of these, 98 occur naturally on Earth (hydrogen to californium). Most of these occur in rocks & minerals, although some occur in very small, trace amounts. Only some elements occur in their native elemental state as minerals. To find a native element in nature, it must be relatively non-reactive and there must be some concentration process. Metallic, semimetallic (metalloid), and nonmetallic elements are known in their native state as minerals. Iron is quite rare in its elemental state at the Earth's surface. In the presence of oxygen, iron turns to rust (iron oxide). Many meteorites that fall to Earth from the asteroid belt are composed of native iron (plus impurities). Very few localities on Earth have native iron of terrestrial origin. These occurrences are along natural smelting zones, where magma or lava has come in direct contact with coals or other carbonaceous sedimentary rocks. In such smelting zones, reducing conditions are created, and metallic iron can crystallize. Famous localities where this has happened include Disko Island in Greenland and the Siberian Traps Flood Basalt Province. Iron has a metallic luster, a silvery-gray color, is somewhat hard (H = 4 to 4.5), is strongly magnetic, has no cleavage, is malleable, and is moderately heavy for its size. Native iron is always alloyed with nickel in meteorites. In terrestrial iron occurrences, the Fe is also alloyed with a little Ni. The rock shown above is a mass of native terrestrial iron from the famous Disko Island, Greenland locality. During the Tertiary, basaltic dikes intruded Cretaceous and lower Tertiary sedimentary rocks of Disko Island. These rocks included coals and carbonaceous shales. The meeting of mafic magma and carbon resulted in a reducing environment - a natural smelter. Native iron formed in the magma as small blebs. When erupted as basalt lava flows or intruded as basalt sills, the iron blebs settled to flow bases and sill bases to form iron masses. Chemical analysis has shown that Disko Island iron masses contain native iron (Fe) and cohenite (iron carbide) plus various inclusions of silicates, sulfides, and oxides (see list in Bird et al., 1981). Locality: Disko Island, offshore western Greenland Disko Island geology synthesized from: Bird, J.M., C.A. Goodrich & M.S. Weathers. 1981. Petrogenesis of Uivfaq iron, Disko Island, Greenland. Journal of Geophysical Research 86(B12): 11,787-11,805. |
Data | |
Jatorria | Iron (Tertiary; Disko Island, Greenland) 2 |
Egilea | James St. John |
Lizentzia
- Askea zara:
- partekatzeko – lana kopiatzeko, banatzeko eta bidaltzeko
- birnahasteko – lana moldatzeko
- Ondorengo baldintzen pean:
- eskuduntza – Egiletza behar bezala aitortu behar duzu, lizentzia ikusteko esteka gehitu, eta ea aldaketak egin diren aipatu. Era egokian egin behar duzu hori guztia, baina inola ere ez egileak zure lana edo zure erabilera babesten duela irudikatuz.
This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/17150419318. It was reviewed on 2015ko maiatzaren 6a by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
2015ko maiatzaren 6a
Fitxategi honetan agertzen diren itemak
honako hau irudikatzen du
some value
17 azaroa 2012
captured with ingelesa
Nikon D90 ingelesa
exposure time ingelesa
0,02 segundo
f-number ingelesa
6,3
270 milimetro
ISO speed ingelesa
400
MIME type ingelesa
image/jpeg
Fitxategiaren historia
Data/orduan klik egin fitxategiak orduan zuen itxura ikusteko.
Data/Ordua | Iruditxoa | Neurriak | Erabiltzailea | Iruzkina | |
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oraingoa | 21:25, 6 maiatza 2015 | 3.576 × 2.513 (3,72 MB) | Natuur12 | Transferred from Flickr via Flickr2Commons |
Irudira dakarten loturak
Hurrengo orrialdeek dute fitxategi honetarako lotura:
Metadatuak
Fitxategi honek informazio gehigarri dauka, ziurrenik kamera digital edo eskanerrak egiterako momentuan gehitutakoa. Hori dela-eta, jatorrizko fitxategi hori aldatu egin bada, baliteke xehetasun batzuek errealitatearekin bat ez egitea.
Kameraren fabrikatzailea | NIKON CORPORATION |
---|---|
Kamera mota | NIKON D90 |
Esposizio denbora | 1/50 s (0,02) |
F Zenbakia | f/6,3 |
Datuen sorreraren data eta ordua | 13:31, 17 azaroa 2012 |
Lentearen fokatze luzera | 270 mm |
Zabalera | 4.288 px |
Altuera | 2.848 px |
Bit osagaiko |
|
Pixelen konposaketa | GBU (RGB) |
Orientazioa | Arrunta |
Atal kopurua | 3 |
Bereizmen horizontala | 300 dpi |
Bereizmen bertikala | 300 dpi |
Erabilitako softwarea | Adobe Photoshop Elements 13.0 (Macintosh) |
Fitxategi aldaketaren data eta ordua | 22:31, 1 maiatza 2015 |
Y eta Cren kokatzea | Gune partekatua |
Esposizio Programa | Definitu gabe |
ISO abiadura | 400 |
Exif bertsioa | 2.21 |
Digitalizazioaren data eta ordua | 13:31, 17 azaroa 2012 |
Osagai bakoitzaren esanahia |
|
Irudi konpresio mota | 4 |
APEX argazkiaren itxiera-abiadura | 5,643856 |
Irekiera | 5,310704 |
Esposizio biasa | 0 |
Gehienezko landa irekiera | 5,3 APEX (f/6,28) |
Distantzia-neurtze modua | Eredua |
Argiaren jatorria | Ezezaguna |
Flash | Flashik gabe, auto modua |
DataDenbora azpisegunduak | 00 |
DataDenboraOrijinala azpisegunduak | 00 |
DataDenboraDigitalizatu azpisekunduak | 00 |
Gaitutako Flashpix bertsioa | 1 |
Kolore tartea | sRGB |
Sensorearen metodoa | Txip bakarreko kolorezko eremu sentsorea |
Fitxategiaren jatorria | Argazki kamera digitala |
Eskena mota | Zuzenean argazkia atera zaion irudi bat |
Irudien prozesamendu pertsonalizatua | Prozesu arrunta |
Esposaketa mota | Esposizio automatikoa |
Txurien oreka | Zurien balantze automatikoa |
Zoom digitalaren eskala | 1 |
35 mm-ko filmerako foku luzera | 405 mm |
Eskena hartze mota | Arrunta |
Eskena kontrola | Gain igotze baxua |
Kontrastea | Arrunta |
Asetasuna | Arrunta |
Fokatzea | Arrunta |
Subjektuaren distantzia balio-eremua | Ezezaguna |
GPS etiketa bertsioa | 2.2.0.0 |
Kameraren serie-zenbakia | 3562538 |
Erabilitako lentea | 18.0-270.0 mm f/3.5-6.3 |
Datuaren metadata azken aldiz aldatu da | 18:31, 1 maiatza 2015 |
Jatorrizko dokumentuaren ID bakarra | 5ACC40DA85C68B5681E837D26500A518 |