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Vendidaite, Al (sub 2) (SO (sub 4) )(OH) (sub 3) Cl.6H (sub 2) O, a new mineral from La Vendida copper mine, Antofagasta region, Chile

Nikita V. Chukanov, Sergey V. Krivovichev, Anastasiya P. Chernyatieva, Gerhard Mohn, Igor V. Pekov, Dmitriy I. Belakovskiy, Konstantin V. Van and Joachim A. Lorenz
Vendidaite, Al (sub 2) (SO (sub 4) )(OH) (sub 3) Cl.6H (sub 2) O, a new mineral from La Vendida copper mine, Antofagasta region, Chile
The Canadian Mineralogist (August 2013) 51 (4): 559-568

Abstract

The new mineral vendidaite was discovered in the abandoned La Vendida mine, near Sierra Gorda, Antofagasta Region, Atacama desert, Chile. Associated minerals are aubertite, magnesioaubertite, belloite, eriochalcite, alunite, kaolinite, and halloysite. Vendidaite forms colorless platy crystals up to 0.01 X 0.3 X 0.3 mm in size; these occur in clusters up to 0.5 mm across. Vendidaite is brittle, with estimated Mohs' hardness of 2-2 1/2 and perfect cleavage on (010). D (sub meas) = 1.97(1) g/cm (super 3) , D (sub calc) = 1.974 g/cm (super 3) . The new mineral is optically biaxial (+), alpha = 1.522(2), beta = 1.524(2), gamma = 1.527(2), 2V (meas.) = 75(15) degrees , 2V (calc.) = 79 degrees . Infra-red spectrum is given. The chemical composition (electron microprobe, H (sub 2) O by gas chromatography) is (in wt.%): Al (sub 2) O (sub 3) 28.51, Fe (sub 2) O (sub 3) 1.39, SO (sub 3) 22.38, Cl 9.87, H (sub 2) O 38.8, O = Cl -2.23, total 98.72. The empirical formula is: Al (sub 1.96) Fe (super 3+) (sub 0.06) (SO (sub 4) ) (sub 0.98) Cl (sub 0.98) (OH) (sub 3.12) 5.98 H (sub 2) O. The crystal structure was solved using single-crystal X-ray diffraction data (R1 = 0.044). Vendidaite is monoclinic, space group C2/c, a 11.9246(16), b 16.134(2), c 7.4573(9) Aa, beta 125.815(2) degrees , V 1163.4(3) Aa (super 3) , and Z = 4. The structure is based upon [Al (sub 2) (OH) (sub 3) (H (sub 2) O) (sub 6) ] (super 3+) chains of edge- and corner-sharing [Al(OH,H (sub 2) O)] octahedra running parallel to the a axis. The chains are linked by hydrogen bonds to (SO (sub 4) ) tetrahedra and Cl (super -) anions to form pseudolayers parallel to the (010) plane. The strongest lines of the powder X-ray diffraction pattern [d, Aa (I, %) (hkl)] are: 6.78 (59) (super (111)) , 4.849 (94) (021), 4.366 (80) (super (131)) , 4.030 (75) (040, 111), 3.855 (100) (super (311)) , 3.285 (59) (131), 2.435 (52) (super (261)) Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4335/1.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 51
Serial Issue: 4
Title: Vendidaite, Al (sub 2) (SO (sub 4) )(OH) (sub 3) Cl.6H (sub 2) O, a new mineral from La Vendida copper mine, Antofagasta region, Chile
Affiliation: Russian Academy of Sciences, Institute of Chemical Physics, Chernogolovka, Russian Federation
Pages: 559-568
Published: 201308
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 12
Accession Number: 2014-004229
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
S23°00'00" - S22°49'60", W69°24'00" - W69°16'00"
Secondary Affiliation: Saint Petersburg State University, RUS, Russian FederationMoscow State University, RUS, Russian FederationRussian Academy of Sciences, Fersman Mineralogical Museum, RUS, Russian FederationRussian Academy of Sciences, Institute of Experimental Mineralogy, RUS, Russian Federation
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: 201404
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