Article
Licensed
Unlicensed
Requires Authentication
The structure of braitschite, a calcium rare earth borate
-
Published/Copyright:
April 2, 2015
Abstract
The crystal structure of braitschite, Ca6.15Na0.85RE2.08[B6O7(OH)3(O,OH)3]4(H2O), is reported here in space group P6/m with unit-cell parameters a = 12.1506(6), c = 7.3678(4) Å, and V = 942.03(8) Å3. Data were collected from a single crystal using a MoKα source and a CCD detector, solved by direct methods, and refined to an R factor of 2.81%. The mineral structure consists of hexaborate fundamental building blocks that polymerize along [001] and are bound by Ca2+ and REE3+ counterions. The framework forms hexagonal channels, which are occupied alternately by Ca2+ cations and water molecules. In an investigation of its thermal stability, braitschite maintains its crystallinity to a temperature of 400 °C, after which it undergoes decomposition. Using Rietveld refinements against powder X-ray diffraction data, we were able to track the loss of water molecules in channels and hydroxyl groups in the covalent B-O network with increasing temperature.
Received: 2010-04-30
Accepted: 2010-08-11
Published Online: 2015-04-02
Published in Print: 2011-01-01
© 2015 by Walter de Gruyter Berlin/Boston
You are currently not able to access this content.
You are currently not able to access this content.
Articles in the same Issue
- A mineralogical, geochemical, and microbiogical assessment of the antimony- and arsenic-rich neutral mine drainage tailings near Pezinok, Slovakia
- Luminescence of diamonds from metamorphic rocks
- Crystal chemistry of Th in fluorapatite
- Hydrogen-bond and cation partitioning in muscovite: A single-crystal neutron-diffraction study at 295 and 20 K
- Spectroscopic characterization of transition metal impurities in natural montebrasite/amblygonite
- An assessment of the potential benefits of ion implants as trace-element reference material for electron probe X-ray microanalysis: The case of invisible gold
- The incorporation of hydroxyl into zircon
- Association between phosphorus and iron oxides in manganese ores
- Equation of state of carbonated hydroxylapatite at ambient temperature up to 10 GPa: Significance of carbonate
- Monoclinic tridymite in clast-rich impact melt rock from the Chesapeake Bay impact structure
- Phase boundary between perovskite and post-perovskite structures in MnGeO3 determined by in situ X-ray diffraction measurements using sintered diamond anvils
- Hydrogenation of FeSi under high pressure
- Fe-Ti oxide-silicate (QUIlF-type) equilibria in feldspathoid-bearing systems
- In situ bubble vesiculation in silicic magmas
- First-principles calculation of the elastic moduli of sheet silicates and their application to shale anisotropy
- A new semi-micro wet chemical method for apatite analysis and its application to the crystal chemistry of fluorapatite-chlorapatite solid solutions
- New insight into the structural transformation of partially dehydroxylated pyrophyllite
- A 94-layer long-period mica polytype: A TEM study
- The crystal structure of stichtite, re-examination of barbertonite, and the nature of polytypism in MgCr hydrotalcites
- Vorlanite (CaU6+)O4—A new mineral from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia
- The structure of braitschite, a calcium rare earth borate
- Alteration of dehydrated schoepite and soddyite to studtite, [(UO2)(O2)(H2O)2](H2O)2
- A reinvestigation of smectite illitization in experimental hydrothermal conditions: Results from X-ray diffraction and transmission electron microscopy
- Letter. The elastic properties of diopside, CaMgSi2O6
Articles in the same Issue
- A mineralogical, geochemical, and microbiogical assessment of the antimony- and arsenic-rich neutral mine drainage tailings near Pezinok, Slovakia
- Luminescence of diamonds from metamorphic rocks
- Crystal chemistry of Th in fluorapatite
- Hydrogen-bond and cation partitioning in muscovite: A single-crystal neutron-diffraction study at 295 and 20 K
- Spectroscopic characterization of transition metal impurities in natural montebrasite/amblygonite
- An assessment of the potential benefits of ion implants as trace-element reference material for electron probe X-ray microanalysis: The case of invisible gold
- The incorporation of hydroxyl into zircon
- Association between phosphorus and iron oxides in manganese ores
- Equation of state of carbonated hydroxylapatite at ambient temperature up to 10 GPa: Significance of carbonate
- Monoclinic tridymite in clast-rich impact melt rock from the Chesapeake Bay impact structure
- Phase boundary between perovskite and post-perovskite structures in MnGeO3 determined by in situ X-ray diffraction measurements using sintered diamond anvils
- Hydrogenation of FeSi under high pressure
- Fe-Ti oxide-silicate (QUIlF-type) equilibria in feldspathoid-bearing systems
- In situ bubble vesiculation in silicic magmas
- First-principles calculation of the elastic moduli of sheet silicates and their application to shale anisotropy
- A new semi-micro wet chemical method for apatite analysis and its application to the crystal chemistry of fluorapatite-chlorapatite solid solutions
- New insight into the structural transformation of partially dehydroxylated pyrophyllite
- A 94-layer long-period mica polytype: A TEM study
- The crystal structure of stichtite, re-examination of barbertonite, and the nature of polytypism in MgCr hydrotalcites
- Vorlanite (CaU6+)O4—A new mineral from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia
- The structure of braitschite, a calcium rare earth borate
- Alteration of dehydrated schoepite and soddyite to studtite, [(UO2)(O2)(H2O)2](H2O)2
- A reinvestigation of smectite illitization in experimental hydrothermal conditions: Results from X-ray diffraction and transmission electron microscopy
- Letter. The elastic properties of diopside, CaMgSi2O6
