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Ferri-obertiite

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Ferri-obertiite is a recently approved amphibole group mineral with the formula NaNa2(Mg3Fe3+Ti)(Si8O22)O2. This highly-sodic amphibole is especially characterized in the presence of oxygen instead of hydroxyl group or fluorine at the W site, which compensates the relatively high positive charge due to dominance of ferric iron and presence of essential titanium. As in case of many other amphiboles, ferri-obertiite is monoclinic with space group C2/m. The root name honors prof. Roberta Oberti, University of Pavia, Italy.[1][2]

References

  1. ^ Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A., and Blass, G., 2015. Ferri-obertiite, IMA 2015-079. CNMNC Newsletter No. 28, December 2015, page ; Mineralogical Magazine 79, 1859–1864
  2. ^ "Ferri-obertiite: Ferri-obertiite mineral information and data". Mindat.org. Retrieved 2016-03-04.
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