| Reference Type | Journal (article/letter/editorial) |
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| Title | The crystal structure of cyanotrichite |
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| Journal | Mineralogical Magazine |
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| Authors | Mills, Stuart J. | Author |
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| Christy, Andrew G. | Author |
| Colombo, Fernando | Author |
| Price, Jason R. | Author |
| Year | 2015 (April) | Volume | 79 |
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| Issue | 2 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2015.079.2.10Search 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 | 244635 | Long-form Identifier | mindat:1:5:244635:0 |
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| GUID | 0 |
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| Full Reference | Mills, Stuart J., Christy, Andrew G., Colombo, Fernando, Price, Jason R. (2015) The crystal structure of cyanotrichite. Mineralogical Magazine, 79 (2) 321-335 doi:10.1180/minmag.2015.079.2.10 |
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| Plain Text | Mills, Stuart J., Christy, Andrew G., Colombo, Fernando, Price, Jason R. (2015) The crystal structure of cyanotrichite. Mineralogical Magazine, 79 (2) 321-335 doi:10.1180/minmag.2015.079.2.10 |
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| Abstract/Notes | AbstractWe report the single-crystal average structure of cyanotrichite, Cu4Al2[SO4](OH)12(H2O)2, from the Maid of Sunshine mine, Arizona, USA. Cyanotrichite crystallizes in space group C2/m, with the unit-cell parameters a = 12.625(3), b = 2.8950(6), c = 10.153(2) Å and β = 92.17(3)o. All non-hydrogen atoms were located and refined to R1 = 0.0394 for all 584 observed reflections [Fo > 4σFo] and 0.0424 for all 622 unique reflections. The cyanotrichite structure consists of a principal building unit of a three-wide [Cu2Al(OH)6] ribbon of edge-sharing Cu and Al polyhedra || b, similar to that found for camerolaite. The ribbons lie in layers || (001) and between these layers, while SO4 tetrahedra and H2O molecules form rods running || b. A hydrogen-bonding scheme is also proposed.A sample of cyanotrichite from the Cap Garonne mine, Le Pradet, France, showed a 4b superstructure with the following unit cell: space group P2/m, a = 12.611(2) Å, b = 11.584(16) = 4 × 2.896(4) Å, c = 10.190(1) Å and β = 92.29(6)o. The supercell could not be refined in detail, but nevertheless imposes constraints on the local structure in that while the space-group symmetry prevents full order of SO4 and H2O in the 4b supercell, it requires that the sequence of species along any given rod is [-SO4-SO4-(H2O)2-(H2O)2-] rather than [-SO4-(H2O)2-SO4-(H2O)2-]. |
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