IMA 2014-076 = vanderheydenite

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Marco E. Ciriotti
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IMA 2014-076 = vanderheydenite

Messaggio da Marco E. Ciriotti » ven 02 mar, 2018 11:40

Prossima pubblicazione.

Referenza:
▪ Elliott, P. & Kolitsch, U. (2018): Description and crystal structure of vanderheydenite, Zn6(PO4)2(SO4)(OH)4⋅7H2O,a new mineral from Broken Hill, New South Wales, Australia. European Journal of Mineralogy, 30, (in press).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 24366
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2014-076 = vanderheydenite

Messaggio da Marco E. Ciriotti » sab 09 giu, 2018 15:34

Referenza:
▪ Elliott, P. & Kolitsch, U. (2018): Description and crystal structure of vanderheydenite, Zn6(PO4)2(SO4)(OH)4⋅7H2O,a new mineral from Broken Hill, New South Wales, Australia. European Journal of Mineralogy, 30, (in press).

Abstract:
Vanderheydenite, Zn6(PO4)2(SO4)(OH)4·7H2O, 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/cm3 from the empirical formula and 3.06 g/cm3 from the ideal formula. The mineral is optically biaxial (–), with α = 1.565(4), β = 1.580(4) and γ = 1.582(4). The calculated 2V is 39.8°. Chemical analysis by electron microprobe gave ZnO 55.63, CuO 0.07, FeO 0.11, MnO 0.06, P2O5 14.18, As2O5 4.33, SO3 8.71, H2O 18.31, total 101.40 wt%, with H2O content derived from the refined crystal structure. The empirical formula calculated on the basis of 23 oxygen atoms is (Zn5.99Cu0.01Fe0.01Mn0.01)Σ6.02[(PO4)1.75(AsO4)0.33]Σ2.08(SO4)0.95(OH)3.91·6.96H2O. The mineral is monoclinic, P21/n, with a = 6.2040(12), b = 19.619(4), c = 7.7821(16) Å, β = 90.67(3)°, V = 947.1(3) Å3. The five strongest lines in the X-ray powder diffraction pattern are [d(Å), (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 > 4σF) contains chains of edge-sharing ZnO6 octahedra parallel to a that are linked by edge- and corner-sharing ZnO5 trigonal bipyramids and TO4 (T = P, As) tetrahedra forming zig-zag sheets parallel to {0 1 0}. Sheets are linked by half-occupied, distorted TO4 (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 H2O groups.
Marco E. Ciriotti

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