Sideronatrite, Na2Fe(SO4)2(OH)·3H2O: Crystal structure of the orthorhombic polytype and OD character analysis
-
Fernando Scordari
and
Gennaro Ventruti
Sideronatrite, Na2Fe(SO4)2(OH)·3H2O, is a secondary hydrated sulfate occurring in desert areas as the result of pyrite alteration. It is one of the environmental indicators of soil-water processes operating in specific landscapes, and, as a consequence, an important marker of acid mine drainage pollution. Sideronatrite has been demonstrated from its peculiar diffraction pattern to belong to a family of OD structures formed by equivalent layers.
In this work, a crystal with weak diffuse streaks proved to be suitable for a single-crystal X-ray diffraction study. The crystal structure was solved by direct methods and refined by full matrix leastsquares (R = 7.4% and RW = 8.0%) in the space group P212121 with a = 7.265(2), b = 20.522(6), c = 7.120(2) Å, V = 1061.5(5) Å3, and Z = 4, using 798 reflections with I > 3.0 σ(I).
Sideronatrite is characterized by infinite [Fe3+(SO4)2(OH)]2- octahedral-tetrahedral chains of the type [M(TO4)2φ] running parallel to the c axis. These chains are cross-linked by a columnar system of corner-sharing, Na-distorted octahedra along c to form corrugated sheets parallel to the (010) plane. Adjacent sheets are hydrogen-bonded through water molecules coordinated by Na atoms. The present results allow a complete description of the OD character of the structure, with the derivation of the OD groupoid and MDO polytypes.
Finally, chemical and structural relationships are taken into account to explain the possible paragenetic sequence concerning several sulfates associated with sideronatrite
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Review Paper. Microbe-clay mineral interactions
- Chemical substitutions, paragenetic relations, and physical conditions of formation of högbomite in the Sittampundi layered anorthosite complex, South India
- Miguelromeroite, the Mn analogue of sainfeldite, and redefinition of villyaellenite as an ordered intermediate in the sainfeldite-miguelromeroite series
- Mechanism and kinetics of a mineral transformation under hydrothermal conditions: Calaverite to metallic gold
- A statistical reassessment of the evidence for the racemic distribution of quartz enantiomorphs
- On the crystal structure and crystal chemistry of pollucite, (Cs,Na)16Al16Si32O96·nH2O: A natural microporous material of interest in nuclear technology
- The effect of fluid inclusion size on determination of homogenization temperature and density of liquid-rich aqueous inclusions
- Effect of SiO2, total FeO, Fe3+/Fe2+, and alkali elements in basaltic glasses on mid-infrared
- Influence of cation size on the low-temperature heat capacity of alkaline earth metasilicate glasses
- The high-pressure–high-temperature behavior of bassanite
- Geochemistry of reversible hydratable tephra from the Trans Mexican Volcanic Belt
- Physical contradictions and remedies using simple polythermal equations of state
- Thermodynamic and crystallographic properties of kornelite [Fe2(SO4)3·~7.75H2O] and paracoquimbite [Fe2(SO4)3·9H2O]
- Humidity-induced phase transitions of ferric sulfate minerals studied by in situ and ex situ X-ray diffraction
- In situ Raman spectroscopy of MgSiO3 enstatite up to 1550 K
- Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures
- New insights into smectite illitization: A zoned K-bentonite revisited
- The hydrothermal conversion of kaolinite to kalsilite: Influence of time, temperature, and pH
- Sideronatrite, Na2Fe(SO4)2(OH)·3H2O: Crystal structure of the orthorhombic polytype and OD character analysis
- Anharmonic OH vibrations in brucite: Small pressure-induced redshift in the range 0–22 GPa
- Structural properties of biologically controlled hydrozincite: An HRTEM and NMR spectroscopic study
- Mechanism of wollastonite carbonation deduced from micro- to nanometer length scale observations
- Letter. Crystal structure of argentopyrite, AgFe2S3, and its relationship with cubanite
- Letter. Magnetite-free, yellow lizardite serpentinization of olivine websterite, Canyon Mountain complex, N.E. Oregon
- Letter. The influence of atomic size and charge of dissolved species on the diffusivity and viscosity of silicate melts
- Letter. Si-Al distribution in high-pressure CaAl4Si2O11 phase: A 29Si and 27Al NMR study
