Abstract
The new species cianciulliite, Mn(Mg,Mn)2Zn2(OH)10·2–4H2O, is monoclinic, C2/m, with a = 15.405(3), b = 6.344,(1), c = 5.562(2) Å, β = 101.23(2)°, V = 533.2 Å3, and Z = 2. The crystal structure was solved by direct methods and refined to R = 4.0% using 675 observed X-ray diffractions. Solution of the structure was essential in determining the correct chemical composition of cianciulliite.
The atomic arrangement consists of two discrete (100) layers, a brucite-type layer and an H2O layer. The brucite-type layer is formed of Mn and Mg octahedra, with the octahedral holes capped by ZnO4 tetrahedra. The apical OH of the Zn tetrahedra are H bonded to the H2O layer. The H2O layer readily loses H2O during microprobe and X-ray analysis.
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