The crystal structure of cyanotrichite
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Mills, Stuart J.; Christy, Andrew; Colombo, Fernando; Price, J.R.
Description
We 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 R 1 = 0.0394 for all 584 observed reflections [F o > 4σF o] and 0.0424 for all 622 unique reflections. The cyanotrichite structure consists of a principal building unit...[Show more]
dc.contributor.author | Mills, Stuart J. | |
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dc.contributor.author | Christy, Andrew | |
dc.contributor.author | Colombo, Fernando | |
dc.contributor.author | Price, J.R. | |
dc.date.accessioned | 2016-06-14T23:20:26Z | |
dc.identifier.issn | 0026-461X | |
dc.identifier.uri | http://hdl.handle.net/1885/103373 | |
dc.description.abstract | We 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 R 1 = 0.0394 for all 584 observed reflections [F o > 4σF o] 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-]. | |
dc.publisher | Mineralogical Society (UK) | |
dc.source | Mineralogical Magazine | |
dc.title | The crystal structure of cyanotrichite | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 79 | |
dc.date.issued | 2015 | |
local.identifier.absfor | 040306 - Mineralogy and Crystallography | |
local.identifier.ariespublication | U3488905xPUB6689 | |
local.type.status | Published Version | |
local.contributor.affiliation | Mills, Stuart J., Museum Victoria | |
local.contributor.affiliation | Christy, Andrew, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Colombo, Fernando, Universidad Nacional de Cordoba | |
local.contributor.affiliation | Price, J.R., Australian Synchrotron | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 2 | |
local.bibliographicCitation.startpage | 321 | |
local.bibliographicCitation.lastpage | 335 | |
local.identifier.doi | 10.1180/minmag.2015.079.2.10 | |
local.identifier.absseo | 970104 - Expanding Knowledge in the Earth Sciences | |
dc.date.updated | 2016-06-14T08:48:58Z | |
local.identifier.scopusID | 2-s2.0-84946028058 | |
Collections | ANU Research Publications |
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