The crystal structure of gordaite NaZn4(SO4)(OH)6Cl · 6H2O
Abstract
The new mineral gordaite [14] from the Sierra Gorda, Chile, has chemical composition NaZn4(SO4)(OH)6Cl · 6H2O and crystallizes trigonal with space group P[unk]. The lattice parameters are a = 8.3556(3) Å and c = 13.025(1) Å. The structure was determined using direct methods and difference Fourier maps. Structure refinement yielded a final R(F)-value of 8.19%.
The structure is characterized by brucite-like sheets of composition [Zn6(OH)12O2]4− which are formed by edgeshared Zn(OH)6 octahedra. One seventh of the octahedral sites in the sheet is vacant. Above and below these sites [Zn(OH)3Cl]2− tetrahedra are located sharing their basal hydroxides with six octahedra. Sulfate groups are connected to the sheets on both sides by corner sharing. The composition for this modified layer is [Zn6oct□oct(OH)6Zn2tet(OH)6Cl2(SO4)2]2−. To compensate for the negative charge Na+ ions which are octahedrally coordinated by water molecules are incorporated between the layers. A complex hydrogen bonding system further links subsequent layers.
The structure of gordaite is closely related to that of the synthetic material Zn4(OH)6SO4 · m H2O with m = 3,5 described by Bear et al. in 1986 and presumably the same material as the one investigated by MacEwan, Cruz Cumplido and Cano Ruiz (1966) who state an average chemical composition of Zn12(OH)15(SO4)3Cl3 · 5H2O. A comparison to these materials as well as to Zn5(OH)8Cl2 · H2O described by Nowacki and Silverman in [12] is drawn.
© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München
Articles in the same Issue
- A Monte Carlo method for indexing
- Kinetic and microstructural studies of the crystallisation of coesite from quartz at high pressure
- Studies on peroxomolybdates XXI. Crystal structure of the ammonium peroxooctamolybdate(VI) (NH4)4[Mo8O24+x(O2)2−x(H2O)2] · 4H2O (x = 0.8)1
- The crystal structure of gordaite NaZn4(SO4)(OH)6Cl · 6H2O
- Transmission electron microscopy evidence of a new tetragonal tungsten bronze superstructure
- A neutron powder investigation of the high-temperature structure and phase transition in stoichiometric LiNbO3
- Syntheses and crystal structures of Co3(C2O4)(SeO3)2 and Zn(C2O4) · 2H2O
- Lithium hydrogenselenite, LiHSeO3: Structure refinement using multiple-wavelength synchrotron radiation data
- Crystal structures of four Cs3MI5 (M = Mn, Cd, Hg) phases and structural relationship among Cs3MI5 compounds
- The crystal structure of polymeric magnesium bis(p-nitrophenolate) dihydrate: [Mg(O2NC6H4O)2(OH2)2]∞
- Crystal structures of neutral trigonal bipyramidal [NiCl2(PMePh2)(PNMe2)] · ½ CH2Cl2 and cationic square planar [NiCl(PMePh2)(PNMe2)][PF6] complexes
- A consideration of the hydrogen bonding schemes of the surfactant N-tetradecyl-(2,4-dihydroxy)-butanoic acid amide and some related amphiphilic compounds
- X-ray crystal structure and computer modelling of 1,2,3-tris(4-quinolyl)cyclopropane
Articles in the same Issue
- A Monte Carlo method for indexing
- Kinetic and microstructural studies of the crystallisation of coesite from quartz at high pressure
- Studies on peroxomolybdates XXI. Crystal structure of the ammonium peroxooctamolybdate(VI) (NH4)4[Mo8O24+x(O2)2−x(H2O)2] · 4H2O (x = 0.8)1
- The crystal structure of gordaite NaZn4(SO4)(OH)6Cl · 6H2O
- Transmission electron microscopy evidence of a new tetragonal tungsten bronze superstructure
- A neutron powder investigation of the high-temperature structure and phase transition in stoichiometric LiNbO3
- Syntheses and crystal structures of Co3(C2O4)(SeO3)2 and Zn(C2O4) · 2H2O
- Lithium hydrogenselenite, LiHSeO3: Structure refinement using multiple-wavelength synchrotron radiation data
- Crystal structures of four Cs3MI5 (M = Mn, Cd, Hg) phases and structural relationship among Cs3MI5 compounds
- The crystal structure of polymeric magnesium bis(p-nitrophenolate) dihydrate: [Mg(O2NC6H4O)2(OH2)2]∞
- Crystal structures of neutral trigonal bipyramidal [NiCl2(PMePh2)(PNMe2)] · ½ CH2Cl2 and cationic square planar [NiCl(PMePh2)(PNMe2)][PF6] complexes
- A consideration of the hydrogen bonding schemes of the surfactant N-tetradecyl-(2,4-dihydroxy)-butanoic acid amide and some related amphiphilic compounds
- X-ray crystal structure and computer modelling of 1,2,3-tris(4-quinolyl)cyclopropane
