| Reference Type | Journal (article/letter/editorial) |
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| Title | Leverettite from the Torrecillas mine, Iquique Provence, Chile: the Co-analogue of herbertsmithite |
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| Journal | Mineralogical Magazine |
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| Authors | Kampf, A. R. | Author |
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| Sciberras, M. J. | Author |
| Williams, P. A. | Author |
| Dini, M. | Author |
| Molina Donoso, A. A. | Author |
| Year | 2013 (October) | Volume | 77 |
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| Issue | 7 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/rruff_1.0/uploads/MM77_3047.pdf+ |
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| DOI | doi:10.1180/minmag.2013.077.7.14Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 244461 | Long-form Identifier | mindat:1:5:244461:5 |
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| GUID | 0 |
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| Full Reference | Kampf, A. R., Sciberras, M. J., Williams, P. A., Dini, M., Molina Donoso, A. A. (2013) Leverettite from the Torrecillas mine, Iquique Provence, Chile: the Co-analogue of herbertsmithite. Mineralogical Magazine, 77 (7) 3047-3054 doi:10.1180/minmag.2013.077.7.14 |
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| Plain Text | Kampf, A. R., Sciberras, M. J., Williams, P. A., Dini, M., Molina Donoso, A. A. (2013) Leverettite from the Torrecillas mine, Iquique Provence, Chile: the Co-analogue of herbertsmithite. Mineralogical Magazine, 77 (7) 3047-3054 doi:10.1180/minmag.2013.077.7.14 |
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| In | (2013, October) Mineralogical Magazine Vol. 77 (7) Mineralogical Society |
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| Abstract/Notes | The new mineral leverettite (IMA 2013-011), ideally Cu3CoCl2(OH)6, was found at the Torrecillas mine, Salar Grande, Iquique Province, Chile, where it occurs as a supergene alteration phase in association with akaganéite, anhydrite, chalcophanite, goethite, halite, manganite, pyrite, quartz and todorokite. Crystals of leverettite are steep rhombohedra to 1 mm with {101} prominent and modified by {001}, sometimes forming V-shaped twins by reflection on {10}. The crystals can also form finger-like, parallel stacked growths along the c axis. The new mineral is medium to deep green in colour and has a light green streak. Crystals are transparent with a vitreous lustre. Mohs hardness is ∼3 and the crystals have a brittle tenacity, a perfect cleavage on {101} and a conchoidal fracture. The measured density is 3.64(2) g cm–3 and calculated density based on the empirical formula is 3.709 g cm–3. Optically, leverettite is uniaxial (–) with ω and ε > 1.8 and exhibits pleochroism with O (bluish green) > E (slightly yellowish green). The empirical formula, determined from electron-microprobe analyses is Cu3(Co0.43Cu0.40Mn0.17Ni0.07Mg0.01)Σ1.08Cl1.87O6.13H6. Leverettite is trigonal (hexagonal), space group Rm, unit-cell parameters a = 6.8436(6) and c = 14.064(1) Å, V = 570.42(8) Å3, Z = 3. The eight strongest X-ray powder diffraction lines are [dobs Å (I)(hkl)]: 5.469(90)(101), 4.701(18)(003), 2.905(22)(021), 2.766(100)(113), 2.269(66)(024), 1.822(26)(033), 1.711(33)(220), 1.383(23)(128). The structure, refined to R1 = 0.023 for 183 Fo > 4σF reflections, shows leverettite to be isostructural with herbertsmithite and gillardite. |
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