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Octahedrite information


Octahedrite
— Structural class —
Octahedrite from Toluca
Compositional typeIron
A phase diagram showing the link between structural and chemical classification.

Octahedrites are the most common structural class of iron meteorites. The structures occur because the meteoric iron has a certain nickel concentration that leads to the exsolution of kamacite out of taenite while cooling.

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Octahedrite

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Octahedrites are the most common structural class of iron meteorites. The structures occur because the meteoric iron has a certain nickel concentration...

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Muonionalusta

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pronunciation: [mʉˈǒːnɪɔnalːɵsta]) is a meteorite classified as fine octahedrite, type IVA (Of) which impacted in northern Scandinavia, west of the border...

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Cape York meteorite

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is one of the largest known iron meteorites, classified as a medium octahedrite in chemical group IIIAB. In addition to many small fragments, at least...

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Iron meteorite

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coarse octahedrites, 6.4–8.7% Ni, 55–100 ppm Ga, 190–520 ppm Ge, 0.6–5.5 ppm Ir, Ge-Ni correlation negative. IB: Ataxites and medium octahedrites, 8.7–25%...

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Nickel

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Widmanstätten pattern showing the two forms of nickel–iron, kamacite and taenite, in an octahedrite meteorite...

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List of largest meteorites on Earth

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6097056; -61.6814750 Octahedrite IAB 28,840 kg (63,580 lb) 5 Armanty 1898 Xinjiang, China 47°N 88°E / 47°N 88°E / 47; 88 Octahedrite IIIE 28,000 kg (62...

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Taenite

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"band, ribbon". Taenite is a major constituent of iron meteorites. In octahedrites it is found in bands interleaving with kamacite forming Widmanstätten...

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Octahedron

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space-filling tetrahedral-octahedral honeycomb. The plates of kamacite alloy in octahedrite meteorites are arranged paralleling the eight faces of an octahedron...

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Kamacite

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It is a major constituent of iron meteorites (octahedrite and hexahedrite types). In the octahedrites it is found in bands interleaving with taenite...

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IIE iron meteorite

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The iron meteorites of the IIE chemical type are octahedrites of various coarseness, most of which contain numerous inclusions of recrystallized stony...

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Impact event

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iron meteorite belonging to the chemical group IIAB and with a coarse octahedrite structure. More than 70 tonnes (metric tons) of material survived the...

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Campo del Cielo

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to 4700 years ago Holocene Exposed Yes Drilled Yes Bolide type Coarse octahedrite to granular hexahedrite Location Coordinates 27°38′S 61°42′W / 27.633°S...

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Ataxite

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ataxite that appears to be a completely metamorphosed and recrystallized octahedrite. Field of view ~2.5 cm across. This is a cut, polished, nitric acid-etched...

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Wabar craters

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kilometers northwest of Wabar, which contained fragments of a Type IIIA octahedrite identical to Wabar fragments, support this northwestern direction of...

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Formation of rocks

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": 145  An example of a primitive rock is the achondritic iron-nickel octahedrite mineral seen in the Widmanstätten pattern that is found in a number of...

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Anatase

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chemistry of an anatase sample. Another name commonly in use for anatase is octahedrite, which is earlier than anatase and given because of the common (acute)...

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Glossary of meteoritics

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chondrite Observed fall – a meteorite that was seen when it fell to Earth. Octahedrite – the most common structural class of iron meteorites. Ordinary chondrite...

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Willamette Meteorite

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Museum of Natural History Type Iron Structural classification Medium octahedrite Group IIIAB Composition 91% Fe, 7.62% Ni, 18.6ppm Ga, 37.3ppm Ge, 4.7ppm...

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IVB meteorite

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wide and lie in a matrix of plessite. The Tlacotepec meteorite is an octahedrite, making a notable exception, as most IVBs are ataxites. Iron meteorites...

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IAB meteorite

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Structurally they can be hexahedrites, fine to coarse octahedrites, or even ataxites. Most of them are octahedrite with medium to coarse taenite-lamella and distinct...

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Pallasite

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the high orthopyroxene content (about 5%). Metal matrix shows a fine octahedrite Widmanstätten pattern. Pallasite ungrouped (P-ung): Specimens that don't...

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Plessite

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fine-grained mixture of the minerals kamacite and taenite found in the octahedrite iron meteorites. It occurs in gaps (its name is derived from the Greek...

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Monturaqui

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asteroid containing iron and nickel. It has been identified as a group I octahedrite and as an IAB meteorite with a size of about 15 m (49 ft). The impact...

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