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出典:『Wikipedia』 (2010/12/13 14:57 UTC 版)

英語による解説

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Fougerite is a recently discovered representative of clay minerals, chemically and structurally related to so-called green rust, hydrotalcite-like minerals (hydrotalcite, pyroaurite, iowaite, manasseite) and other layered double hydroxides. The formula of the mineral is complex due to structural variabilities, as is for green rust, thus different formulas can be found elsewhere. The structure is based on brucite-like layers. Fougerite crystallizes in trigonal system. The originally given formula for fougerite is [Fe²⁺_1-xFe³⁺_xMg_y(OH)_2+2y]^+x[x/n A^-n.mH₂O]^-x where A denotes an interlayer anion, n denotes valency, by 1/4 ≤ x/(1+y) ≤ 1/3 and m ≤ (1-x+y) (Trolard et al. 2007).