Ferri-obertiite
A variety of Obertiite Root Name Group
What is Ferri-obertiite?
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)(Mg3FeTi)(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. The name honors professor Roberta Oberti of the University of Pavia, Italy.
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Quick Facts
Physical Properties
- Color
- Pink-orange
Chemical Properties
- Chemical Formula
- Na(Na2)(Mg3Fe3+Ti)(Si8O22)O2 Ferri-obertiite is a obertiite root name amphibole in the WO2- dominant amphibole group with Mg as the dominant element in the C2+ position and Fe3+ as the dominant element in the C3+ position.
- Elements
- Fe, Mg, Na, O, Si, Ti
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