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Michel Fleck, Uwe Kolitsch
Natural and synthetic compounds with kröhnkite-type chains. An update
The crystal structures of five new triclinic double salt dihydrates have been determined from single-crystal X-ray diffraction data. The following four compounds all contain kröhnkite-[Na2Cu(SO4)2 · 2 H2O]-type tetrahedral-octahedral chains: the three isotypic synthetic compounds K2Mg(CrO4)2 · 2 H2O (a = 5.674(1), b = 6.462(1), c = 7.517(2) Å, α = 110.38(3), β = 95.24(3), γ = 109.86(3)°, V = 236.0(1) Å3, R(F) = 0.036, space group P-1, no. 2, Z = 1), K2Mg(MoO4)2 · 2 H2O (a = 5.884(1), b = 6.491(1), c = 7.700(1) Å, α = 111.67(2), β = 96.59(2), γ = 108.62(2)°, V = 249.8(1) Å3, R(F) = 0.019, space group P-1, no. 2, Z = 1) and K2Mn(SeO4)2 · 2 H2O (a = 5.674(1), b = 6.608(1), c = 7.523(2) Å, α = 110.31(3), β = 95.69(3), γ = 108.35(3)°, V = 244.10(9) Å3, R(F) = 0.024, space group P-1, no. 2, Z = 1), and the mineral messelite Ca2(Fe2+,Mn2+,Mg)(PO4)2 · 2 H2O (a = 5.480(1), b = 5.759(1), c = 6.569(1) Å, α = 90.18(3), β = 102.62(3), γ = 108.45(3)°, V = 191.3(1) Å3, R(F) = 0.022, space group P-1, no. 2, Z = 1).
Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag
Print ISSN: 0044-2968
Volume: 218, 08/2003
Pages: 553