Widmanstätten patterns of kamacite and taenite, from a meteorite currently in the Natural History Museum, London.
General
Category
Metals and intermetallic alloys
Formula (repeating unit)
γ-(Ni,Fe)
IMA symbol
Tae[1]
Strunz classification
1.AE.10
Crystal system
Isometric
Crystal class
Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m)
Space group
Fm3m
Identification
Color
metallic grayish to white
Cleavage
None
Fracture
Hackly fracture
Tenacity
Malleable, flexible
Mohs scale hardness
5–5.5
Luster
metallic
Streak
light gray
Diaphaneity
Opaque
Specific gravity
7.8–8.22
Other characteristics
magnetic, not radioactive
References
[2][3]
Widmanstätten pattern showing the two forms of Nickel-Iron, Kamacite and Taenite, in an octahedrite meteorite
Taenite is a mineral found naturally on Earth mostly in iron meteorites. It is an alloy of iron and nickel, with a chemical formula of Fe,Ni and nickel proportions of 20% up to 65%.
The name is derived from the Greek ταινία for "band, ribbon". Taenite is a major constituent of iron meteorites. In octahedrites it is found in bands interleaving with kamacite forming Widmanstätten patterns, whereas in ataxites it is the dominant constituent. In octahedrites a fine intermixture with kamacite can occur, which is called plessite.
Taenite is one of four known Fe-Ni meteorite minerals: The others are kamacite, tetrataenite, and antitaenite.
^Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Taenite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved 14 March 2022.
^http://webmineral.com/data/Taenite.shtml Archived 2021-01-22 at the Wayback Machine Webmineral data
Taenite is a mineral found naturally on Earth mostly in iron meteorites. It is an alloy of iron and nickel, with a chemical formula of Fe,Ni and nickel...
hexahedrite types). In the octahedrites it is found in bands interleaving with taenite forming Widmanstätten patterns. In hexahedrites, fine parallel lines called...
iron and nickel, mainly in the form of the mineral phases kamacite and taenite. Meteoric iron makes up the bulk of iron meteorites but is also found in...
impurities (such as cobalt or carbon) may be present. Taenite is 20% to 65% nickel. Kamacite and taenite are also found in nickel iron meteorites. The most...
certain nickel concentration that leads to the exsolution of kamacite out of taenite while cooling. Octahedrites derive their name from the crystal structure...
(a massive impure form of uraninite) Plessite (mixture of kamacite and taenite) Potassium alum or potash alum (as a mineral, is called alum-(K)) Qingsongite...
meteoric iron that usually consists of two mineral phases: kamacite and taenite. Most iron meteorites originate from cores of planetesimals, with the exception...
found in a number of iron-rich meterorites. Consisting of kamacite and taenite and formed under extremely slow cooling conditions—about 100 to 10,000 °C/Myr...
characterized by several iron-nickel alloy species. Two examples are kamacite and taenite, which are found in iron meteorites; these species differ by the amount...
alloy, taenite. It is one of the mineral phases found in meteoric iron. Tetrataenite forms naturally in iron meteorites that contain taenite that are...
chondrites. The IAB meteorites are composed of meteoric iron (kamacite and taenite) and silicate inclusions. Structurally they can be hexahedrites, fine to...
iron, a native metal found in meteorites that consists of the mineral taenite with minor amounts of plessite, troilite, and microscopic lamellae of kamacite...
structure. There are three known Fe-Ni meteoritic minerals: kamacite, taenite, and tetrataenite. The existence of antitaenite as a new mineral species...
iron meteorites composed of iron-nickel alloys, such as kamacite and/or taenite. Most iron meteorites are thought to come from the cores of planetesimals...
Stony-iron Subgroups A B C anomalous Composition Meteoric iron (kamacite, taenite & tetrataenite); silicates (mostly pyroxene & Ca-rich plagioclase); sulphides...
mixtures tend to exsolve into a mixture of iron-rich kamacite and iron-poor taenite.: 27 Magnetochemistry Dunlop, David J.; Özdemir, Özden (1997). Rock magnetism:...
texture consisting of a fine-grained mixture of the minerals kamacite and taenite found in the octahedrite iron meteorites. It occurs in gaps (its name is...
Earth turn out to be ferronickel, and take the form of kamacite and/or taenite.[citation needed] Ferronickel has a face-centred cubic crystal structure...
mineralogy of the meteoric iron. During cooling kamacite is exsolved from taenite. The lower the concentration of nickel, the more kamacite is formed. IIABs...
weapons. About 1 in 20 meteorites consist of the unique iron-nickel minerals taenite (35–80% iron) and kamacite (90–95% iron). Native iron is also rarely found...
Tetrarooseveltite Troo Timroseite Tim Tounkite Tou Tsepinite-Na Tsp-Na Taenite Tae Tavorite Tav Tetrataenite Ttae Tin (stannum) Sn Tourmaline Tur Tsepinite-Sr...
Metallic meteorites are composed primarily of the iron-nickel alloys: taenite (high nickel content) and kamacite (low nickel content). However, there...
fine grained intergrowth found in meteoric iron consisting of kamacite, taenite and tetrataenite lamella. Presolar grains – interstellar solid matter in...
very rare kamacite lamella. The meteoric iron is a part of the lamella taenite. The total chemical composition is 82.8% iron, 16.6% nickel, and the rest...
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