| Reference Type | Journal (article/letter/editorial) |
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| Title | Paratacamite-(Mg), Cu3(Mg,Cu)Cl2(OH)6; a new substituted basic copper chloride mineral from Camerones, Chile |
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| Journal | Mineralogical Magazine |
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| Authors | Kampf, A. R. | Author |
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| Sciberras, M. J. | Author |
| Leverett, P. | Author |
| Williams, P. A. | Author |
| Malcherek, T. | Author |
| Schlüter, J. | Author |
| Welch, M. D. | Author |
| Dini, M. | Author |
| Molina Donoso, A. A. | Author |
| Year | 2013 (December) | Volume | 77 |
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| Page(s) | 3113-3124 | Issue | 8 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2013.077.8.06Search in ResearchGate |
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| Mindat Ref. ID | 244468 | Long-form Identifier | mindat:1:5:244468:4 |
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| GUID | 58c04e40-d3fd-4ace-b191-7e024c86875d |
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| Full Reference | Kampf, A. R., Sciberras, M. J., Leverett, P., Williams, P. A., Malcherek, T., Schlüter, J., Welch, M. D., Dini, M., Molina Donoso, A. A. (2013) Paratacamite-(Mg), Cu3(Mg,Cu)Cl2(OH)6; a new substituted basic copper chloride mineral from Camerones, Chile. Mineralogical Magazine, 77 (8) 3113-3124 doi:10.1180/minmag.2013.077.8.06 |
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| Plain Text | Kampf, A. R., Sciberras, M. J., Leverett, P., Williams, P. A., Malcherek, T., Schlüter, J., Welch, M. D., Dini, M., Molina Donoso, A. A. (2013) Paratacamite-(Mg), Cu3(Mg,Cu)Cl2(OH)6; a new substituted basic copper chloride mineral from Camerones, Chile. Mineralogical Magazine, 77 (8) 3113-3124 doi:10.1180/minmag.2013.077.8.06 |
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| Abstract/Notes | AbstractParatacamite-(Mg) (IMA 2013-014), Cu3(Mg, Cu)Cl2(OH)6, is the new Mg-analogue of paratacamite. It was found near the village of Cuya in the Camarones Valley, Arica Province, Chile. The mineral is a supergene secondary phase occurring in association with anhydrite, atacamite, chalcopyrite, copiapite, dolomite, epsomite, haydeeite, hematite, magnesite and quartz. Paratacamite-(Mg) crystals are rhombs and thick to thin prisms up to 0.3 mm in size exhibiting the forms {201} and {001}. Twinning by reflection on {10} is common. The mineral is transparent with a vitreous lustre, with medium to deep-green colour and light-green streak. Mohs hardness is 3–3½, the tenacity is brittle and the fracture is conchoidal. Paratacamite-(Mg) has one perfect cleavage on {201}. The measured and calculated densities are 3.50(2) and 3.551 g cm–3, respectively. The mineral is optically uniaxial (–) with ε = 1.785(5) and ω > 1.8 and slight pleochroism: O (bluish green) > E (green). Electron-microprobe analyses provided the empirical formula Cu3(Mg0.60Cu0.38Ni0.01Mn0.01)Cl2(OH)6. The mineral is easily soluble in dilute HCl. Paratacamite-(Mg) is trigonal, R, with cell parameters a = 13.689(1), c = 14.025(1) Å, V = 2275.8(3) Å3 and Z = 12. There is a pronounced sub-cell corresponding to a' ≈ ½a, c' ≈ c in space group Rm. The eight strongest lines in the X-ray powder diffraction pattern are [dobs Å(I)(hkl)]: 5.469(87)(021), 4.686(26)(003), 2.904(34)(401), 2.762(100)(22,042), 2.265(81)(404), 1.819(26)(603), 1.710 (34)(440) and 1.380(19)(446). The structure was refined to R1 = 0.039 for 480 Fo > 4σF reflections. Refinement using interlayer Mg-Cu site scattering factors indicated that Mg is distributed statistically between both interlayer octahedra M1O6 and M2O6. A comparison of the distortions associated with M1O6 and M2O6 octahedra suggest that the sample is near the upper compositional limit for stability of the R phase. |
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