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Description and crystal structure of vanderheydenite, Zn (sub 6) (PO (sub 4) ) (sub 2) (SO (sub 4) )(OH) (sub 4) .7H (sub 2) O, a new mineral from Broken Hill, New South Wales, Australia

Peter Elliott and Uwe Kolitsch
Description and crystal structure of vanderheydenite, Zn (sub 6) (PO (sub 4) ) (sub 2) (SO (sub 4) )(OH) (sub 4) .7H (sub 2) O, a new mineral from Broken Hill, New South Wales, Australia
European Journal of Mineralogy (July 2018) 30 (4): 835-840

Abstract

Vanderheydenite, Zn (sub 6) (PO (sub 4) ) (sub 2) (SO (sub 4) )(OH)4.7H (sub 2) O, is a new mineral from the Block 14 Opencut, Broken Hill, New South Wales, Australia. It occurs as aggregates of colourless crystals up to 0.5 mm across in voids of a sphalerite-galena matrix and is associated with anglesite, pyromorphite, sulfur, and liversidgeite. Crystals are pseudohexagonal blades up to 0.4 mm in length, flattened on {1 0 0} and exhibiting the forms {1 0 0}, {0 1 0}, and {0 2 1}. Cleavage was not observed. The Mohs hardness is estimated to be 3. The calculated density is 3.12 g/cm (super 3) from the empirical formula and 3.06 g/cm (super 3) from the ideal formula. The mineral is optically biaxial (-), with alpha = 1.565(4), beta = 1.580(4) and gamma = 1.582(4). The calculated 2V is 39.8 degrees . Chemical analysis by electron microprobe gave ZnO 55.63, CuO 0.07, FeO 0.11, MnO 0.06, P (sub 2) O (sub 5) 14.18, As (sub 2) O (sub 5) 4.33, SO (sub 3) 8.71, H (sub 2) O 18.31, total 101.40 wt%, with H (sub 2) O content derived from the refined crystal structure. The empirical formula calculated on the basis of 23 oxygen atoms is (Zn (sub 5.99) Cu (sub 0.01) Fe (sub 0.01) Mn (sub 0.01) ) (sub Sigma 6.02) [(PO (sub 4) ) (sub 1.75) (AsO (sub 4) ) (sub 0.33) ] (sub Sigma 2.08) (SO (sub 4) ) (sub 0.95) (OH) (sub 3.91) .6.96H (sub 2) O. The mineral is monoclinic, P2 (sub 1) /n, with a = 6.2040(12), b = 19.619(4), c = 7.7821(16) Aa, beta = 90.67(3) degrees , V = 947.1(3) Aa (super 3) . The five strongest lines in the X-ray powder diffraction pattern are [d(Aa), (I), (hkl)]: 9.826 (57) (0 2 0), 7.296 (20) (0 1 1), 6.134 (1 0 0) (0 2 1), 3.368 (10) (0 3 2, 1 5 0), 3.069 (9) (2 1 0, 0 4 2). The crystal structure of vanderheydenite (R1 = 0.0497 for 939 reflections with Fo > 4sigma F) contains chains of edge-sharing ZnO (sub 6) octahedra parallel to a that are linked by edge- and corner-sharing ZnO (sub 5) trigonal bipyramids and TO (sub 4) (T = P, As) tetrahedra forming zig-zag sheets parallel to {0 1 0}. Sheets are linked by half-occupied, distorted TO (sub 4) (T = P, S) tetrahedra in the [0 1 1] direction. Interstitial channels extend parallel to the a-direction and are occupied by strongly to weakly hydrogen-bonded H (sub 2) O groups.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 30
Serial Issue: 4
Title: Description and crystal structure of vanderheydenite, Zn (sub 6) (PO (sub 4) ) (sub 2) (SO (sub 4) )(OH) (sub 4) .7H (sub 2) O, a new mineral from Broken Hill, New South Wales, Australia
Affiliation: University of Adelaide, Department of Earth Sciences, Adelaide, South Aust., Australia
Pages: 835-840
Published: 201807
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 20
Accession Number: 2018-094161
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
S31°57'32" - S31°57'32", E141°28'30" - E141°28'30"
Secondary Affiliation: Naturhistorisches Museum, AUT, Austria
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201850
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