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Tillmannsite (Ag (sub 3) Hg)(V,As)O (sub 4) , a new mineral; its description and crystal structure

Halil Sarp, Dmitry Yu. Pushcharovsky, Elizabeth J. MacLean, Simon J. Teat and Natalia V. Zubkova
Tillmannsite (Ag (sub 3) Hg)(V,As)O (sub 4) , a new mineral; its description and crystal structure
European Journal of Mineralogy (February 2003) 15 (1): 177-180


Tillmannsite, (Ag (sub 3) Hg)(V,As)O (sub 4) , was found in the old copper mines of Roua (Alpes-Maritimes, France), associated with pecoraite, vesignieite, olivenite, kolfanite, janggunite, chlorargyrite, cuprite, native copper, native silver, native silver containing 2% of mercury, domeykite, djurleite and algodonite. It forms aggregates (0.2 mm diameter) consisting of pseudooctahedral crystals (50 mu m maximum dimension). The crystals are red, brownish red. The mineral is tetragonal, I4, a = 7.727(7) Aa, c = 4.648(5) Aa, V = 277.5(5) Aa (super 3) , Z = 2 and D (sub calc) = 7.733(3) g/cm (super 3) . The strongest lines in the X-ray powder diffraction pattern (d (sub obs) in Aa, (hkl), I (sub vis) ) are: 5.45, (110), 25; 2.772, (211), 100; 2.324, (002), 30; 2.254, (301), 20. Luster is adamantine translucent, streak is brownish red; crystals are uniaxial (+) with omega approximately 2.3, epsilon approximately 2.5 at 589 nm. Pleochroism is intense with epsilon = red orange intense, omega = orange brown. The crystal structure was solved from data collected using synchrotron radiation by traditional direct methods and refined using 350 observed unique reflections to R(F) = 0.037, Rw(F (super 2) ) = 0.075. The structure of tillmannsite contains isolated tetrahedra (V,As)O (sub 4) and tetrahedral clusters (Ag (sub 3) Hg) formed by metallic atoms. Each (Ag,Hg) metallic atom is coordinated by 3 metallic neighbors and by 3 oxygens.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 1
Title: Tillmannsite (Ag (sub 3) Hg)(V,As)O (sub 4) , a new mineral; its description and crystal structure
Affiliation: Departement de Mineralogie du Museum d'Histoire Naturelle de Geneve, Geneva, Switzerland
Pages: 177-180
Published: 200302
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 19
Accession Number: 2003-026007
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N43°30'00" - N44°19'60", E06°40'00" - E07°45'00"
Secondary Affiliation: Moscow State University, RUS, Russian FederationCCLRC Daresbury Laboratory, GBR, United Kingdom
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 200309
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