The crystal structure of cyanotrichite
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]
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