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GEOREF RECORD

Dokuchaevite, Cu (sub 8) O (sub 2) (VO (sub 4) ) (sub 3) Cl (sub 3) , a new mineral with remarkably diverse Cu (super 2+) mixed-ligand coordination environments

Oleg I. Siidra, Evgeny V. Nazarchuk, Anatoly N. Zaitsev, Yury S. Polekhovsky, Thomas Wenzel and John Spratt
Dokuchaevite, Cu (sub 8) O (sub 2) (VO (sub 4) ) (sub 3) Cl (sub 3) , a new mineral with remarkably diverse Cu (super 2+) mixed-ligand coordination environments
Mineralogical Magazine (October 2019) 83 (5): 749-755

Abstract

Dokuchaevite, ideally Cu (sub 8) O (sub 2) (VO (sub 4) ) (sub 3) Cl (sub 3) , was found in the Yadovitaya fumarole of the Second scoria cone of the North Breach of the Great Tolbachik Fissure Eruption (1975-1976), Tolbachik volcano, Kamchatka Peninsula, Russia. Dokuchaevite occurs on the crusts of various copper sulfate exhalative minerals (such as kamchatkite and euchlorine) as individual prismatic crystals. Dokuchaevite is triclinic, P1, a=6.332(3), b=8.204(4), c=15.562(8) Aa, alpha =90.498(8), beta =97.173(7), gamma =90.896(13) degrees , V=801.9(7) Aa (super 3) and R (sub 1) =0.057. The eight strongest lines of the X-ray powder diffraction pattern are (d, Aa (I)(hkl): (15.4396)(18)(001), (7.2762)(27)(011), (5.5957)(43)(012), (4.8571)(33)(111), (3.1929) (29)(023), (2.7915)(30)(202), (2.5645)(21)(032), (2.5220)(100)(130), (2.4906)(18)(130) and (2.3267)(71)(222). The chemical composition determined by electron-microprobe analysis is (wt.%): CuO 60.87, ZnO 0.50, FeO 0.36, V (sub 2) O (sub 5) 19.85, As (sub 2) O (sub 5) 6.96, SO (sub 3) 0.44, MoO (sub 3) 1.41, SiO (sub 2) 0.20, P (sub 2) O (sub 5) 0.22, Cl 10.66, -O=Cl (sub 2) 2.41, total 99.06. The empirical formula calculated on the basis of 17 anions per formula unit is (Cu (sub 7.72) Zn (sub 0.06) Fe (sub 0.05) ) (sub Sigma 7.83) (V (sub 2.20) As (sub 0.61) Mo (sub 0.10) S (sub 0.06) P (sub 0.03) Si (sub 0.03) ) (sub Sigma 3.03) O (sub 13.96) Cl (sub 3.04) . The crystal structure of dokuchaevite represents a new structure type with eight Cu sites, which demonstrate the remarkable diversity of Cu (super 2+) mixed-ligand coordination environments. The crystal structure of dokuchaevite is based on OCu (sub 4) tetrahedra that share common corners thus forming [O (sub 2) Cu (sub 6) ] (super 8+) single chains. Two of the eight symmetrically independent copper atoms do not form Cu-O bonds with additional oxygen atoms, and thus are not part of the OCu (sub 4) tetrahedra, but provide the three-dimensional integrity of the [O (sub 2) Cu (sub 6) ] (super 8+) chains into a framework. TO (sub 4) mixed tetrahedral groups are located within the cavities of the framework. The structural formula of dokuchaevite can be represented as Cu (sub 2) [Cu (sub 6) O (sub 2) ](VO (sub 4) ) (sub 3) Cl (sub 3) .


ISSN: 0026-461X
EISSN: 1471-8022
Serial Title: Mineralogical Magazine
Serial Volume: 83
Serial Issue: 5
Title: Dokuchaevite, Cu (sub 8) O (sub 2) (VO (sub 4) ) (sub 3) Cl (sub 3) , a new mineral with remarkably diverse Cu (super 2+) mixed-ligand coordination environments
Affiliation: Saint Petersburg State University, Department of Crystallography, Saint Petersburg, Russian Federation
Pages: 749-755
Published: 201910
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 30
Accession Number: 2020-006736
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
N55°49'02" - N55°49'02", E160°22'02" - E160°22'02"
Secondary Affiliation: Russian Academy of Sciences, Kola Science Center, RUS, Russian FederationNatural History Museum, GBR, United KingdomUniversitaet Tuebingen, DEU, Germany
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202006
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