Abstract
THE orthorhombic anthophyllite minerals and the monoclinic cummingtonites and grunerites are members of two isomorphous amphibole series of composition (Mg,Fe2+)7Si8O22(OH)2. (All anthophyllites considered here have less than one aluminium (III) ion per formula unit3.) Anthophyllites have been described1,2 with 0–3.28 iron (II)* ions per formula unit, while compositions between 2.02 and 6.67 iron (II) ions have been recorded in the cummingtonite–grunerite series2,3, which implies the existence of some compositional overlap between the two series. Aluminium-rich anthophyllites (gedrites) show a much wider range of iron concentration, ranging up to Fe5Al2-(Al2Si6)O22(OH)2 (ref. 2).
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References
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BANCROFT, G., MADDOCK, A., BURNS, R. et al. Cation Distribution in Anthophyllite from Mössbauer and Infra-red Spectroscopy. Nature 212, 913–915 (1966). https://doi.org/10.1038/212913a0
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DOI: https://doi.org/10.1038/212913a0
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