Chemistry:Ferri-obertiite

From HandWiki

Ferri-obertiite is an amphibole group mineral that was formally approved by the International Mineralogical Association in 2015. It has the chemical formula Na(Na2)(Mg3Fe3+Ti)(Si8O22)O2.[1] Ferri-obertiite is highly sodic and is especially characterized in the presence of oxygen instead of a hydroxy group or fluorine at the W site, which compensates for the relatively high positive charge due to the dominance of ferric iron and presence of titanium. Similar to many other amphiboles, ferri-obertiite is monoclinic with space group C2/m.[1][2]

The name honors professor Roberta Oberti of the University of Pavia, Italy.[2]

References

  1. 1.0 1.1 "Ferri-obertiite: Ferri-obertiite mineral information and data". http://www.mindat.org/min-46414.html. Retrieved 2016-03-04. 
  2. 2.0 2.1 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