IMA 2019-049 = lauraniite

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Marco E. Ciriotti
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IMA 2019-049 = lauraniite

Messaggio da Marco E. Ciriotti » lun 03 ott, 2022 16:02

Prossima pubblicazione.

Referenza:
▪ Elliott, P. & Kampf, A.R. (2022): Lauraniite, Cu6Cd2(SO4)2(OH)12·5H2O, a new copper cadmium sulphate mineral from the Laurani Mine, Bolivia. Canadian Mineralogist, 60, (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: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: IMA 2019-049 = lauraniite

Messaggio da Marco E. Ciriotti » sab 22 ott, 2022 16:31

Pubblicazione effettuata.

Referenza:
▪ Elliott, P. & Kampf, A.R. (2022): Lauraniite, Cu6Cd2(SO4)2(OH)12·5H2O, a new copper cadmium sulphate mineral from the Laurani Mine, Bolivia. Canadian Mineralogist, 60, 825-836.

Abstract:
Lauraniite, Cu6Cd2(SO4)2(OH)125H2O, is a new mineral from the Laurani Mine, Aroma Province, La Paz Department, Bolivia, where it is found as a secondary mineral associated with serpierite and brochantite, on a matrix consisting of tennantite and chalcocite. Lauraniite occurs as bladed crystals up to 110 lm in length. Crystals are pale blue and transparent, with a vitreous luster and a white streak. Fracture is uneven. Cleavage is perfect on {100}. The calculated density is 3.40 g/cm3 based on the empirical formula. Optically, lauraniite is uniaxial (þ) with a=1.637(3), b=1.638(3), c=1.638(3) (white light), 2V=20(2)8, and orientation Z’ a. The empirical formula, based on data obtained from electron microprobe analysis, is Cu6.13(Cd1.62Zn0.24)(SO4)1.96(OH12.03Cl0.05)12.085.08H2O. Lauraniite is monoclinic, P21/c, a = 7.3200(15), b = 25.424(5), c = 11.283(2) °A, beta = 91.62(3)8, V = 2099.0(7) °A3, and Z = 4. The crystal structure, determined using single-crystal data obtained using synchrotron radiation, refined to R1 = 0.0468% for 5999 observed reflections with Fo . 4r(Fo). It is characterized by undulating, brucite-like sheets consisting of seven Cu/6 (/: O2–, OH– , H2O) octahedra and two Cd(OH)6(H2O) polyhedra. Sheets are decorated on one side by corner-sharing SO4 tetrahedra. Linkages between adjacent sheets are provided by H-bonds.
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