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x = 0-0.5. The original analysis show Na>Li and the published composition falls within the compositional boundaries of ferri-leakeite.
Bluish black
Specific Gravity:
3.23 (Calculated)
Crystal System:
Named in 2004 by Roberta Oberti, Fernando Cámara, and José Maria Caballero in honor of Eric James William Whittaker [November 1, 1921 England, UK - July 2, 2015 Kidlington, Oxfordshire, England, UK], reader of mineralogy at Oxford University for his important contribution to mineral crystal structures and crystal chemistry, particularly amphiboles.

Whittakerite was discredited as an amphibole root name in the 2012 amphibole nomenclature.
A synonym of Ferri-leakeite
This page provides mineralogical data about Ferriwhittakerite.

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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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