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Hydrothermal Synthesis And Crystal Structure Of Also4(Oh): A Titanite-Group Member
-
Alan J. Anderson
und
Robert T. Downs
Veröffentlicht/Copyright:
10. Januar 2015
Abstract
Aluminum hydroxysulfate, AlSO4(OH), is postulated to play a vital role in controlling the solubility of aluminum in sulfate-rich acidic soils and ground waters, but it has not yet been confirmed in nature. This study reports the synthesis of an AlSO4(OH) crystal at 700 °C and ~1.0 GPa in a hydrothermal diamond-anvil cell from a mixture of 95% H2SO4 and Al2O3 powder and its structure determination from single-crystal X‑ray diffraction data. AlSO4(OH) is monoclinic with space group C2/c and unitcell parameters a = 7.1110(4), b = 7.0311(5), c = 7.0088(4) Å, b = 119.281(2)°, and V = 305.65(3) Å3. Its crystal structure is characterized by kinked chains of corner-sharing AlO6 octahedra that run parallel to the c-axis. These chains are linked together by SO4 tetrahedra and hydrogen bonds, forming an octahedral-tetrahedral framework. Except for the numbers and positions of H atoms, AlSO4(OH) is isostructural with the kieserite-type minerals, a subgroup of the titanite group of minerals. A comparison of powder X‑ray diffraction patterns indicates that our AlSO4(OH) is the same as that obtained by Shanks et al. (1981) through hydrolysis of Al2(SO4)3 solutions at temperatures above 310 °C. To date, AlSO4(OH) has been synthesized only at temperatures above 290 °C, implying that it may not stable in low-temperature environments, such as acidic soils and mine waters. The possible environments to find Al(OH)SO4 may include places where sulfur-rich magma-derived fluids react with aluminous rocks under elevated temperature and pressure, and on Venus where a sulfur-rich atmosphere interacts with surface rocks at temperatures above 400 °C.
Keywords : AlSO4(OH); aluminum hydroxysulfate; X‑ray diffraction; crystal structure; Raman spectroscopy; high temperature
Received: 2014-8-12
Accepted: 2014-9-26
Published Online: 2015-1-10
Published in Print: 2015-1-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
AlSO4(OH);
aluminum hydroxysulfate;
X‑ray diffraction;
crystal structure;
Raman spectroscopy;
high temperature
Artikel in diesem Heft
- The American Mineralogist at 100 years, and a mineralogy renaissance
- At the blurry edge of mineralogy
- Mineral evolution and Earth history
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- The rapid expansion of environmental mineralogy in unconventional ways: Beyond the accepted definition of a mineral, the latest technology, and using nature as our guide
- Microelectronic junctions in arsenian pyrite due to impurity and mixed sulfide heterogeneity
- The structure of water-saturated carbonate melts
- In-situ measurements of fluorine and chlorine speciation and partitioning between melts and aqueous fluids in the Na2O-Al2O3-SiO2-H2O system
- High-pressure high-temperature transitions in MgCr2O4 and crystal structures of new Mg2Cr2O5 and post-spinel MgCr2O4 phases with implications for ultrahigh-pressure chromitites in ophiolites
- Mid-infrared emission spectroscopy and visible/near-infrared reflectance spectroscopy of Fe-sulfate minerals
- Megacrystic zircon with planar fractures in miaskite-type nepheline pegmatites formed at high pressures in the lower crust (Ivrea Zone, southern Alps, Switzerland)
- Tourmaline as a petrogenetic monitor of the origin and evolution of the Berry-Havey pegmatite (Maine, U.S.A.)
- Applications of Hirshfeld surfaces to mineralogy: An example of alumohydrocalcite, and the classification of the dundasite group minerals
- Optical absorption anisotropy of high-density, wide-gap, high-hardness SiO2 polymorphs seifertite, stishovite, and coesite
- The system Na2CO3-FeCO3 at 6 GPa and its relation to the system Na2CO3-FeCO3-MgCO3
- Chlorine-hydroxyl diffusion in pargasitic amphibole
- The use of cation-cation and anion-anion bonds to augment the bond-valence model
- AIM analysis and the form of the bond-valence equation
- Atomistic simulation on mixing thermodynamics of calcite-smithsonite solid solutions
- Combined geochemistry and geochronology constrains coupled subduction of oceanic and continental crust in the Huwan shear zone, central China
- Near-infrared investigation of folding sepiolite
- First-principles study of sulfur isotope fractionation in pyrite-type disulfides
- Tetrataenite in terrestrial rock
- Thermo-compression of pyrope-grossular garnet solid solutions: Non-linear compositional dependence
- Phase relationships in the system K2CO3-CaCO3 at 6 GPa and 900–1450 °C
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