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Figure 1 View of the two building blocks of tamarugite, the [Al(H2O)6]3+ octahedron and a segment of an infinite double-strand chain [Na(SO4)2]3− extending along [001]. Thermal displacement ellipsoids are shown at the 50% probability level. Symmetry operators: none x,y,z; (i) 1-x,-y,-z; (ii) x,y,-1+z; (iii) 1-x,-y,1-z. |