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About: Ferri-obertiite     Goto   Sponge   NotDistinct   Permalink

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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. 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.