Sulfate minerals: crystallography, geochemistry, and by C.N. Alpers, J.L. Jambor, D.K. Nordstrom

By C.N. Alpers, J.L. Jambor, D.K. Nordstrom

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22c). The packing of the chains in the structure is shown in Figure 22d; interchain linkage involves only hydrogen bonding. The chain in kröhnkite, Na2[Cu2+(H2O)2(SO4)2], can be described as based on cis [M(TO4)2Ø4] clusters (Fig. 13e) polymerized by corner-sharing between polyhedra (Fig. 20e, 22e). The chains are linked together by interstitial Na and hydrogen bonds from 34 Hawthorne, Krivovichev & Burns T 8a Crystal Chemistry of Sulfate Minerals T8b + f 21 a-d Figure 21. (a) The chain of edge-sharing (AlØ6) octahedra in aluminite; (b) the linkage of octahedral chains, (SO4) tetrahedra, and (H2O) groups through hydrogen bonds (shown as dashed lines) in aluminite; (c) the chain of alternating corner-sharing octahedra and tetrahedra in the minerals of the chalcanthite group; (d) interchain linkage to (SO4) tetrahedra and (H2O) groups through hydrogen bonds (shown as dashed lines) in chalcanthite.

In addition to this cluster, römerite contains isolated {Fe2+(H2O)6} octahedra (Fig. 18c), and these elements are linked by hydrogen bonding both between unconnected octahedra and 28 Hawthorne, Krivovichev & Burns Figure 17. The structures of (a) jurbanite; (b) xitieshanite; (c) blödite, shown as [Mg(H2O)4(SO4)2] clusters and Na atoms; (d,e) blödite as a framework of (MgØ6) octahedra, (NaØ6) octahedra, and (SO4) tetrahedra; (f) mereiterite. Crystal Chemistry of Sulfate Minerals 29 Figure 18. The structures of (a) chenite, based on [Cu(OH)4(SO4)2] clusters, Pb atoms, and (OH)anions; (b) the sheet of Pb and Cu atoms and (OH)-groups in chenite; (c) römerite; (d) apjohnite.

In the structure of aubertite, {Cu2+(H2O)6}{Al(H2O)6}(SO4)2Cl(H2O)2 (Fig. 14f), hydrogen bonding between octa-hedra and tetrahedra involves interstitial Cl as well as (H2O) groups. g. cyanochroite, K2{Cu2+(H2O)6}(SO4)2, the {M2+(H2O)6} and (SO4) groups are linked by K into sheets parallel to (100) (Fig. 15a), which are linked together by hydrogen bonding from the octahedral ligands to the acceptor anions of the sulfate group. The structure of sodium alum, Na{Al(H2O)6}(SO4)2(H2O)6, consists of {Al(H2O)6}, {Na(H2O)6}, and (SO4) groups linked by hydrogen bonding (Fig.

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