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Mineralogical ClassificationZincolibethenite = IMA 2003-010

25th May 2005 01:28 UTCJim Ferraiolo

<05M/2002> A new mineral, zincolibethenite, CuZnPO4OH, a stoichiometric species of specific site occupancy. R. S. W. Braithwaite, R. G. Pritchard, W. H. Paar & R. A. D. Pattrick, Mineralogical Magazine, 69(2), 2005, pp 145–153.

Zincolibethenite occurs as tiny green crystals on material from Broken Hill mines, Kabwe, Zambia; it is associated with hopeite and tarbuttite. The bright blue-green, transparent, long prismatic crystals (< 1 mm long) have a cleavage perpendicular to their length, and occur in tightly packed sheaves and radiating clusters; H. 3½, Dcalc 3.972 g/cm3; a 1.660, b 1.705, g 1.715, 2Va(calc) 49°, r < v. The average of 15 spot EPMA values gave Cu 26.0, Zn 27.7, P 12.8, H2O(by diff.) 3.63, leading to the formula CuZnPO4OH. Indexed XRD powder data are tabulated; strongest lines 4.7937(100), 2.6325(47), 5.8676(39), 2.9351(33), 3,.6993(22) Å; a 8.326, b 8.260, c 5.877 Å, V 404.5 Å3, Z = 4, space group Pnnm. Single-crystal X-ray data confirm that Cu(II) occupies the five-coordinate site. The IR spectra of zincolibethenite and libethenite are presented. The name is for the relationship to libethenite.

8th Jun 2005 12:27 UTCUwe Kolitsch

The abstract given is incorrect (apparently it is an older version which had to be changed according to comments by the referees; note specifically that the crystal-chemical interpretation "... confirm that Cu(II) occupies the five-coordinate site" in the older version is incorrect).

Tiny green crystals from Kabwe, Zambia, associated with hopeite and tarbuttite (and probably first recorded in 1908 but never adequately characterized because of their scarcity) have been studied by X-ray diffraction, microchemical and electron probe microanalysis, infrared spectroscopy, and synthesis experiments. They are shown to be orthorhombic, stoichiometric CuZnPO4OH, of species rank, forming the end-member of a solid-solution series to libethenite, Cu2PO4OH, and are named zincolibethenite. The libethenite structure is unwilling to accommodate any more Zn substituting for Cu at atmospheric pressure, syntheses using Zn-rich solutions precipitating a mixture of zincolibethenite with hopeite, Zn3(PO4)2.4H2O. Single-crystal X-ray data confirm that the Cu(II) occupies the Jahn-Teller distorted 6-coordinate cation site in the libethenite lattice, and the Zn(II) occupies the 5-coordinate site. The space group of zincolibethenite is Pnnm, the same as that of libethenite, with unit-cell parameters a = 8.326, b = 8.260, c = 5.877 Å, V = 404.5 Å3, Z = 4, calculated density = 3.972 g/cm3 (libethenite has a = 8.076, b = 8.407, c = 5.898 Å, V = 400.44 Å3, Z = 4, calculated density = 3.965 g/cm3). Zincolibethenite is biaxial negative, with 2Valpha (calc.) of 49°, r

Uwe Kolitsch

8th Jun 2005 14:05 UTCUwe Kolitsch

Does anyone who is a Min. Mag. (and Eur. J. Mineral.) personal subscriber also have problems downloading PDF versions of the full articles from the corresponding IngentaConnect websites?

Uwe

9th Jun 2005 12:36 UTCJim Ferraiolo

Thanks, Uwe.

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