Octahedrite
|
|
Octahedrites are a class of nickel iron meteorites. Typically composed of the alloys of nickel-iron: taenite - nickel-iron with high nickel content and kamacite - nickel-iron with low nickel content. A iron nickel phosphide, schreibersite, is present in some nickel-iron meteorites as well as an iron nickel cobalt carbide, cohenite. When polished and acid etched the classic Widmanstätten lines, criss-cross pattern of intersecting lines of lamellar kamacite, are visible.
Octahedrite is also an obsolete synonym for anatase, a titanium oxide mineral.
References
- Webmineral (http://webmineral.com/data/Kamacite.shtml)
- Meteorites Australia (http://www.amonline.net.au/geoscience/meteors/types.htm)
- Octahedrite Widmanstätten Pattern (http://www.meteorlab.com/METEORLAB2001dev/irons.htm#Octahedrites)Template:Mineral-stub