出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/06/19 02:59 UTC 版)
Ataxites are a class of iron meteorites. They are composed mainly of the alloy taenite, and also contain plessite, troilite, and microscopic lamellae of kamacite. They have no visible Widmanstätten pattern. Ataxites are the most nickel-rich meteorites known, they usually contain over 18% nickel. The high nickel content is the reason that they do not develop a Widmanstätten pattern, 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.