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ataxite
Ataxites (from Greek meaning "without structure") are a structural class of iron meteorites with a high nickel content and show no Widmanstätten patterns upon etching.
==Characteristics==
Ataxites are composed mainly of meteoric iron, a native metal found in meteorites that consists of the mineral taenite with minor amounts of plessite, troilite, and microscopic lamellae of kamacite. Ataxites are the most nickel-rich meteorites known; they usually contain over 18% nickel.〔Vagn F. Buchwald, Handbook of Iron Meteorites. University of California Press, 1975〕 The high nickel content is the reason that they do not develop a Widmanstätten structure, because in this case kamacite can be exsolved from taenite only at such a low temperature (below about 600°C) where diffusion is already too slow.〔F. Heide, F. Wlotzka, Meteorites, Messengers from Space, Springer-Verlag 1995, page 143〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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