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American Mineralogist; February 1998; v. 83; no. 1-2; p. 167-171
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Ferri-clinoholmquistite, Li 2 (Fe (super 2+) ,Mg) 3 Fe (super 3+) 2 Si 8 O 22 (OH) 2 , a new B Li clinoamphibole from the Pedriza Massif, Sierra de Guadarrama, Spanish Central System

Jose M. Caballero, Angeles Monge, Angel La Iglesia, and Fernando Tornos

Universidad Complutense de Madrid, Departmento de Petrologia y Geoquimica, Madrid, Spain
CSIC Instituto de Ciencia de los Materials, Madrid, Spain
CSIC Instituto de Geologia Economica, Madrid, Spain
Instituto Tecnologico Geominero de Espana, Madrid, Spain

Ferri-clinoholmquistite is a new amphibole species from episyenites in the East Pedriza Massif (Central System, Spain), where it is associated to albite, augite-aegirine, titanite, andradite, magnetite, and apatite. It is black, vitreous, translucent, non-fluorescent, and brittle. It shows gray streak, H(Mohs) = 6, splintery fracture, perfect {110} cleavage, (001) parting, D meas = 3.19, and D cal = 3.25. Crystals are prismatic, elongated on [001]. In plane-polarized light, it is strongly pleochroic: X = yellow green, Y = indigo blue, Z = green blue, with absorption XZ (meas) = 72(7), 2V Z (calc) = 84(6), r3 , Z = 2. X-ray powder-diffraction pattern data were determined. Analysis by a combination of electron microprobe and flame photometry gives the following formula, calculated assuming OH+F = 2 and T sites fully occupied by Si: A (Na (sub 0.43) K (sub 0.03) ) B (Li (sub 1.66) Na (sub 0.30) Ca (sub 0.04) ) C (Fe (super 3+) (sub 1.54) Fe (super 2+) (sub 1.35) Mg (sub 1.21) Li (sub 0.49) Al (sub 0.20) Ti (super 4+) (sub 0.12) Mn (super 2+) (sub 0.07) Zn (sub 0.02) ) T (Si 8 )O 22 (OH (sub 1.58) F (sub 0.42) ). From crystallographic refinements the M4 site is split, implying ordering of Li and Na, and within the A cavity, Na occupies the Am position.

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