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Zavaliaite, (Mn (super 2+) , Fe (super 2+) , Mg) (sub 3) (PO (sub 4) ) (sub 2) , a new member of the sarcopside group from the La Empleada Pegmatite, San Luis Province, Argentina

Frederic Hatert, Encarnacion Roda-Robles, Philippe de Parseval and Johan Wouters
Zavaliaite, (Mn (super 2+) , Fe (super 2+) , Mg) (sub 3) (PO (sub 4) ) (sub 2) , a new member of the sarcopside group from the La Empleada Pegmatite, San Luis Province, Argentina (in Granitic pegmatites and their minerals; a second tribute to Petr Cerny, Miguel A. Galliski (editor), David London (editor), Milan Novak (editor) and Robert F. Martin (editor))
The Canadian Mineralogist (December 2012) 50 (6): 1445-1452

Abstract

Zavaliaite, (Mn (super 2+) ,Fe (super 2+) ,Mg) (sub 3) (PO (sub 4) ) (sub 2) , belongs to the sarcopside group of minerals and corresponds to the Mn (super 2+) equivalent of sarcopside and chopinite. It occurs at the La Empleada pegmatite, San Luis Province, Argentina. Zavaliaite forms colorless and transparent exsolution-lamellae up to 70 mu m thick and 1.5 mm long in lithiophilite. Owing to hydration, the mineral partially hydrates to reddingite, (Mn (super 2+) ,Fe (super 2+) ) (sub 3) (PO (sub 4) ) (sub 2) .3H (sub 2) O. Lamellae of zavaliaite display a perfect cleavage along the {100} or {001} direction. The luster is vitreous to resinous, and the streak is white. Optically, the mineral is biaxial (-), with an average index of refraction of 1.66(1) (for lambda = 589 nm), 2V (sub meas) = 15(5) degrees . It is non-pleochroic, without dispersion; the cleavage plane shows an angle of ca. 45 degrees with the elongation of the lamellae; X is perpendicular to this cleavage plane. Zavaliaite is non-fluorescent under short-wave and long-wave ultraviolet light, and its calculated density is 3.68 g/cm (super 3) . The mineral is brittle, with a Mohs hardness of 4. The mean chemical composition, determined with an electron microprobe from 27 point analyses (wt.%), is: P (sub 2) O (sub 5) 41.38, FeO 24.94, MgO 6.09, MnO 27.08, total 99.49. The empirical formula, calculated on the basis of eight atoms of oxygen per formula unit, is (Mn (super 2+) (sub 1.31) Fe (super 2+) (sub 1.19) Mg (sub 0.52) ) (sub Sigma 3.02) (P (sub 1.00) O (sub 4) ) (sub 2) . Zavaliaite is monoclinic, space group P2 (sub 1) /c, a 6.088(1), b 4.814(1), c 10.484(2)Aa, beta 89.42(3) degrees , V 307.2(1) Aa (super 3) , and Z = 2. The crystal structure is identical to that of sarcopside and chopinite, with the M1 site occupied by 0.5 Fe (super 2+) + 0.35Mn (super 2+) + 0.15 Mg, and the M2 site occupied by 0.475 Mn (super 2+) + 0.35 Fe (super 2+) + 0.175 Mg. The strongest eight lines in the X-ray powder pattern [d in Aa (intensities estimated visually) (hkl)] are: 6.75 (very strong) (100), 3.54 (weak) (012)(111), 2.964 (strong) (200), 2.816 (weak) (013), 2.537 (strong) (113), 1.894 (very strong) (220), 1.848 (very strong) (311), and 1.652 (very strong) (313)(313). The mineral has been approved by the Commission on New Minerals and Mineral Names of the International Mineralogical Association [IMA 2011-012], and is named in honor of Maria Florencia de Fatima Marquez Zavalia [or Marquez-Zavalia], investigator of Argentinian minerals and ore assemblages and Head of the Department of Mineralogy, Petrography and Geochemistry, IANIGLA, CCT Mendoza, CONICET (National Research Council of Argentina).


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 50
Serial Issue: 6
Title: Zavaliaite, (Mn (super 2+) , Fe (super 2+) , Mg) (sub 3) (PO (sub 4) ) (sub 2) , a new member of the sarcopside group from the La Empleada Pegmatite, San Luis Province, Argentina
Title: Granitic pegmatites and their minerals; a second tribute to Petr Cerny
Author(s): Hatert, FredericRoda-Robles, Encarnacionde Parseval, PhilippeWouters, Johan
Author(s): Galliski, Miguel A.editor
Author(s): London, Davideditor
Author(s): Novak, Milaneditor
Author(s): Martin, Robert F.editor
Affiliation: Universite de Liege, Departement de Geologie, Liege, Belgium
Pages: 1445-1452
Published: 201212
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 26
Accession Number: 2013-032396
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables, sketch map
S36°30'00" - S32°00'00", W67°30'00" - W65°10'00"
Secondary Affiliation: Universidad del Pais Vasco, ESP, SpainUniversite de Toulouse, FRA, FranceUniversite2. Notre-Dame de la Paix, BEL, Belgium
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201320
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