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Hoganite and paceite, two new acetate minerals from the Potosi mine, Broken Hill, Australia

Published online by Cambridge University Press:  05 July 2018

D. E. Hibbs ,
U. Kolitsch ,
P. Leverett ,
J. L. Sharpe  and
P. A. Williams
D. E. Hibbs
Affiliation:
School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
U. Kolitsch
Affiliation:
Institut für Mineralogie und Kristallographie, Universität Wien, Geozentrum, Althanstrasse 14, A-1090 Vienna, Austria
P. Leverett*
Affiliation:
Centre for Industrial and Applied Mineralogy, School of Science, Food and Horticulture, BCRI Parramatta Campus, University of Western Sydney, Locked Bag 1797, Penrith South DC NSW 1797, Australia
J. L. Sharpe
Affiliation:
Centre for Industrial and Applied Mineralogy, School of Science, Food and Horticulture, BCRI Parramatta Campus, University of Western Sydney, Locked Bag 1797, Penrith South DC NSW 1797, Australia
P. A. Williams
Affiliation:
Centre for Industrial and Applied Mineralogy, School of Science, Food and Horticulture, BCRI Parramatta Campus, University of Western Sydney, Locked Bag 1797, Penrith South DC NSW 1797, Australia
*
*E-mail: [email protected]
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Abstract

Hoganite, copper(II) acetate monohydrate, and paceite (pronounced ‘pace-ite’), calcium(II) copper(II) tetraacetate hexahydrate, occur as isolated crystals embedded in ferruginous gossan from the Potosi Pit, Broken Hill, New South Wales, Australia. They are associated with goethite, hematite, quartz, linarite, malachite, azurite, cerussite and cuprian smithsonite. Hoganite is bluish green with a pale blue streak and a Mohs hardness of 1½; it possesses perfect {001} and distinct {110} cleavages and has a conchoidal fracture. Chemical analysis of hoganite gave (wt.%) C 23.85; H 3.95; Cu 31.6; Fe 0.4; O (by difference) 40.2, yielding an empirical formula of C4H7.89O5.07Cu1.00Fe0.01. The simplified formula is C4H8O5Cu or Cu(CH3COO)2.H2O, the mineral being identical to the synthetic compound of the same formula. Single-crystal X-ray data for hoganite are: monoclinic, space group C2/c, a = 13.162(3), b = 8.555(2), c = 13.850(3)Å, β = 117.08(3)°, Z = 8. The density, calculated from single-crystal data, is 1.910 g cm−3. The strongest lines in the X-ray powder pattern are [dobs (Iobs) (hkl)] 6.921 (100) (011); 3.532 (28) (202); 6.176 (14) (200); 3.592 (11) (22); 5.382 (10) (11); 2.278 (10) (204); 5.872 (9) (002). Hoganite (orientation presently unknown) is biaxial positive with α = 1.533(2), β = 1.541(3), γ = 1.554(2), 2V(meas.) = 85(5)°, 2V(calc.) = 76.8°, dispersion is r < v, medium (white light); it is strongly pleochroic with X = blue, Y = pale bluish, Z = pale bluish green and absorption X > Y > Z. The mineral is named after Graham P. Hogan of Broken Hill, New South Wales, Australia, a miner and well-known collector of Broken Hill minerals.

Paceite is dark blue with a pale blue streak and a Mohs hardness of 1½; it possesses perfect {100} and {110} cleavages and has an uneven fracture. Chemical analysis of paceite gave (wt.%) C 21.25; H 5.3; Ca 9.0; Cu 14.1; O (by difference) 50.35, yielding an empirical formula of C8H23.77O14.23Ca1.02-Cu1.00. The simplified formula is C8H24O14CaCu or CaCu(CH3COO)4.6H2O, the mineral being identical to the synthetic compound of the same formula. Unit-cell data (refined from X-ray powder diffraction data) for paceite are: tetragonal, space group I4/m, a = 11.155(4), c = 16.236(17)Å, Z = 4. The density, calculated from refined cell data, is 1.472 g cm−3. The strongest lines in the X-ray powder pattern are [dobs (Iobs) (hkl)] 7.896 (100) (110); 3.530 (20) (310); 5.586 (15) (200); 8.132 (8) (002); 9.297 (6) (101); 2.497 (4) (420); 3.042 (3) (321). Paceite is uniaxial positive with ω = 1.439(2) and ɛ = 1.482(3) (white light); pleochroism is bluish with a greenish tint (O), pale bluish with a greyish tint (E), and absorption O ⩾ E. The mineral is named after Frank L. Pace of Broken Hill, New South Wales, Australia, an ex-miner and well-known collector of Broken Hill minerals.

Keywords

hoganitepaceitenew mineralacetateBroken HillAustralia
Type
Research Article
Information
Mineralogical Magazine , Volume 66 , Issue 3 , June 2002 , pp. 459 - 464
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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References

Andrews, E.C. (1922) Geology of the Broken Hill district. Memoirs of the Geological Survey of New South Wales, 8, 246.Google Scholar
Bell, S.J., Jennings, K.L., Danielson, E.D., Solomon, E.I. and Musselman, R.L. (1995) Single crystal morphology of the copper acetate dimers Cu2(CH3COO)4.2H2O and Cu2(CH3COO)4.pz. Journal of Crystal Growth, 154, 108–12.CrossRefGoogle Scholar
Birch, W.D., editor (1999) The Minerals of Broken Hill. Broken Hill City Council, Broken Hill, NSW, Australia.Google Scholar
de Meester, P., Fletcher, S.R. and Skapski, A.C. (1973) Refined crystal structure of tetra- μ- acetato-bisaquodico pper(II). Journal of the Chemical Society, Dalton Transactions, 2575–2578.Google Scholar
Dunn, P.J. (1981) Copper acetate hydrate with native copper. Mineralogical Record, 12, 49.Google Scholar
Gmelin, (1961 a) Gmelins Handbuch der anorganischen Chemie. System-number 60: Kupfer, 8. Auflage, Teil B, Lieferung 2, pp. 679–84. Verlag Chemie, Weinheim, Germany.Google Scholar
Gmelin, (1961 b) Gmelins Handbuch der anorganischen Chemie. System-number 60: Kupfer, 8. Auflage, Teil B, Lieferung 2, pp. 702–3. Verlag Chemie, Weinheim, Germany.Google Scholar
Holden, A. and Singer, P. (1961) Crystals and Crystal Growing. Heinemann, London, UK, pp. 118-9, 242–5, 293.Google Scholar
Jaquet, J.B. (1894) Geology of the Broken Hill lode Barrier Ranges mineral field. Memoirs of the Geological Survey of New South Wales, 5, 124.Google Scholar
Klop, E.A., Duisenberg, A.J.M. and Spek, A.L. (1983) Reinvestigation of the structure of calcium copper acetate hexahydrate, CaCu(C2H3O2)4.6H2O. Acta Crystallographica, C39, 1342–4.Google Scholar
Langs, D.A. and Hare, C.R. (1967) The crystal structure of calcium copper acetate hexahydrate and its isomorph calcium cadmium acetate hexahydrate. Journal of the Chemical Society, Chemical Communications, 890–891.Google Scholar
Mortland, R. and Webster, A.E. (1998) Broken Hill lead-zinc-silver deposit. Pp. 619–626 in: Geology of Australian and Papua New Guinean Mineral Deposits (Berkman, D.A. and Mackenzie, D.H., editors). The Australasian Institute of Mining and Metallurgy, Melbourne, Australia.Google Scholar
Palache, C., Berman, H. and Frondel, C. (1951) The System of Mineralogy. 7th edition, Vol. II, John Wiley & Sons, New York, p. 1107.Google Scholar
Sheldrick, G.M. (1990) Phase annealing in SHELX-90: direct methods for larger structures. Acta Crystallographica, A46, 467–473.CrossRefGoogle Scholar
Sheldrick, G.M. (1997) SHELXL-97. A program for the refinement of crystal structures. University of Göttingen, Germany.Google Scholar
Winchell, A.N. (1954) The Optical Properties of Organic Compounds. 2nd edition. Academic Press, New York.Google Scholar
Žáček, V. (1991) Natural occurrence of orthorhombic calcium acetate monohydrate (Kladno, central Bohemia, Czechoslovakia). Časopispro Mineralogii a Geologii, 36, 77–82.Google Scholar