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The Canadian Mineralogist; February 2009; v. 47; no. 1; p. 173-180; DOI: 10.3749/canmin.47.1.173
© 2009 Mineralogical Association of Canada
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THE CRYSTAL STRUCTURE OF ERCITITE, Na2(H2O)4[Mn3+2(OH)2(PO4)2], AND ITS RELATION TO BERMANITE, Mn2+(H2O)4[Mn3+2(OH)2(PO4)2]

Mark A. Cooper, Frank C. Hawthorne§ and Petr Cerny

Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada


Figure 1
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  		FIG. 1. The [(Mn3+(OH)(PO4)] sheet in ercitite (a) projected onto a plane close to (001), with the sheet tilted 5° about a horizontal axis to give a clearer view of the polyhedron linkage; (b) projected onto the (100) plane.

 

Figure 2
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  		FIG. 2. Stacking of [Mn3+(OH)(PO4)] sheets in (a) ercitite projected down [001], and (b) bermanite projected down [010]. Dark grey polyhedra: lower layer; light grey polyhedra: upper layer.

 

Figure 3
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  		FIG. 3. Position of intersheet polyhedra (pale grey with crosses) above the [Mn3+(OH) (PO4)] sheet (dark grey): (a) [7]Na in ercitite projected down [001], (b) [6]Mn2+ in bermanite projected down [010].

 

Figure 4
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  		FIG. 4. Connectivity between [Mn3+(OH)(PO4)] sheets in (a) ercitite projected down [100], and (b) bermanite projected down [101]. Legend as in Figure 3.

 

Figure 5
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  		FIG. 5. Position of M(2) octahedra above the [Mn3+(OH)(PO4)] sheet in ercitite, projected down [001]. Legend as in Figure 3, light grey with crosses: M(2) octahedra.

 




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