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Ferri-ottoliniite

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Formula:
◻{NaLi}{Mg3Fe3+2}(Si8O22)(OH)2
Colour:
Black
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
Ottoliniite was named for Luisa Ottolini (Pavia, Italy) to acknowledge her contribution to crystal-chemical studies of minerals, and particularly of amphiboles.
Synonym:
Ferri-ottoliniite was approved as a new mineral in 2001. In the 2012 amphibole nomenclature, it's compposition is considered intermediate between clino-ferri-holmquistite and magnesio-riebeckite, and the ottoliniite root name is discredited.

The holotype material, A(K0.07Na0.38)B(Na0.70Li1.24Ca0.06)C(Mg1.35Fe2+0.92Mn2+0.13 Zn0.31Fe3+1.71Al0.10Ti0.06Li0.42) Si8 O22 (OH1.51F0.47). has Li>Na in the B position and is consequently considered a clino-ferri-holmquistite.


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References for Ferri-ottoliniiteHide

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Oberti, R., F. Cámara, & J.M. Caballero (2004), Ferri-ottoliniite and ferriwhittakerite, two new end-members of the new Group 5 for monoclinic amphiboles: American Mineralogist: 88: 888-893.
Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch (2012): Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97, pages 2031–2048

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