1972•Zeitschrift für KristallographieRequires access
Crystal structure and hydrogen bonding of copiapite
Peter Süsse
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Abstract
The structure of copiapite, MgFe 4 [(OH) 2 |(SO 4 ) 6 ] · 20H 2 O, is triclinic, space group P [unk], with a = 7.342 Å, b = 18.818 Å, c = 7.389 Å, α = 91.45°, β = 102.15°, and γ = 98.85°. Fe(O,OH,H 2 O) 6 octahedra and sulfate tetrahedra are connected to form one-dimensional infinite complexes along [101]. Mg(H 2 O) 6 octahedra and water molecules not bound to cations lie between the complexes. These structural groups are interconnected only by hydrogen bonds.