Chalcophanite crystal structure

The crystal structure of the mineral chalcophanite, ZnMn307-3H20 (see Fig. II), was one of the first layer structures of manganese oxides that has been determined. 

Post, J. E. Appleman, D. E. (1988) Chalcophanite, ZnMn307.3H20 New crystal-structure determination. Amer. Mineral., 73, 1401-4. 

Wadsley AD (1952) The structure of lithiophorite, (Al,Li)Mn02(0H)2. Acta Cryst 5 676-680 Wadsley AD (1955) The crystal structure of chalcophanite, ZnMn307.3H20. Acta Cryst 8 1165-1172 Wasserman SR, Allen PG, Shuh DK, Bucher JJ, Edelstein NM (1999) EXAFS and principal component... 

Figure 2. Polyhedral representations of crystal structures ofMn oxide minerals with layer structures. (A) Lithiophorite. (B) Chalcophanite. (C) Na-rich bimessite-like phase showing disordered H20/Na (light color ball) sandwiched between the Mn octahedral sheets. Adapted from (8).

Post and Veblen [65] investigated the crystal structures of several synthetic sodium, potassium, and magnesium bimessites by electron diffraction methods and Rietveld refinements of XRD patterns. Starting from the crystal structure of chalcophanite they determined the atomic arrangement in these compounds. The materials of the composition A,cMn02-yH20 (A = Na, K, Mg) have monochnic symmetry (see Table 3.3). Post and Veblen reported a number of detailed structural... 

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