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Concentrations of trace elements (germanium, gallium and iridium) are used to separate the iron meteorites into chemical classes, which correspond to separate asteroid parent bodies. Chemical classes that include hexahedrites are: [4] IIAB meteorites (includes also some octahedrites) IIG meteorites
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.
Widmanstätten pattern in the Staunton meteorite [i] In 1808, these figures were observed by Count Alois von Beckh Widmanstätten, the director of the Imperial Porcelain works in Vienna. While flame heating iron meteorites, [4] Widmanstätten noticed color and luster zone differentiation as the various iron alloys oxidized at different rates ...
Vickers hardness test was applied to a number of kamacite samples and shocked meteorites were found to have values of 160–170 kg/mm and non-shocked meteorites can have values as high as 244 kg/mm. [7] Shock causes a unique iron transformation structure that is able to be measured using metallographic and X-ray diffraction techniques. After ...
Meteorite classification may indicate that a "genetic" relationship exists between similar meteorite specimens. Similarly classified meteorites may share a common origin, and therefore may come from the same astronomical object (such as a planet, asteroid, or moon) known as a parent body. However, with current scientific knowledge, these types ...
A meteorite mineral is a mineral found chiefly or exclusively within meteorites or meteorite-derived material. [ citation needed ] This is a list of those minerals, excluding minerals also commonly found in terrestrial rocks.
The Buseck Center for Meteorite Studies was founded in 1960, on the Tempe Campus of Arizona State University, and houses the world's largest university-based meteorite collection. The collection contains specimens from over 1,600 separate meteorite falls and finds , and is actively used internationally for planetary , geological and space ...
The Cape York meteorite, also known as the Innaanganeq meteorite, is one of the largest known iron meteorites, classified as a medium octahedrite in chemical group IIIAB. [5] In addition to many small fragments, at least eight large fragments with a total mass of 58 tonnes have been recovered, the largest weighing 31 tonnes (31 long tons; 34 ...