Mn 6 octahedra

Figure 30 (opposite page). The crystal structures of bermanite and schoonerite (a) bemianite projected onto (010) (b) bemianite projected onto (001) (c) schoonerite projected onto (001) note that Zn is (5]-coordinated (d) schoonerite projected onto (010). (Mn ( )6) octahedra and (Zn 4) tetrahedra are shadow-shaded, ( Mn, Fe, Fe ( )6) octahedra are dot-shaded, Mn and (H2O) gronps are shown as shaded circles. 

Seamanite, [Mn 3(B(0H 4)(P04)], is a mixed phosphate-borate mineral based on chains of (Mn( )6) octahedra that consist of free-sharing trimers that link by... 

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See also in sourсe #XX -- [ , , , ]

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