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BNa–BLi solid-solution in A-site-vacant amphiboles: synthesis and cation ordering along the ferri-clinoferroholmquistite–riebeckite join
-
Gianluca Iezzi
,
Fernando Cámara
Veröffentlicht/Copyright:
31. März 2015
Abstract
Amphiboles were hydrothermally synthesized at 500 °C and 4 kbar in the system Li2O-Na2OFeO- Fe2O3-SiO2-H2O, with nominal compositions along the riebeckite [□Na2Fe32+Fe23+Si8O22(OH)2]-ferri-clinoferroholmquistite [□Li2Fe32+Fe23+Si8O22(OH)2] join, where the exchange vector is NaLi-1 at the B-site. Experimental products were characterized by powder XRD and SEM-EDAX, confirming very high amphibole yield along the join (>95%, plus minor quartz). The XRD patterns can be indexed in C2/m, and the refined cell parameters show linear variation as a function of composition. For the BLi end-member, the IR spectrum shows a single sharp main band centered at 3614 cm-1, which is assigned to the FeFeFe-OH-A□ configuration. With increasing BNa in the mineral, this band broadens and shifts 4 cm-1 to higher frequencies. This effect can be attributed to the change in M4 site occupancy. Minor ANa (partial solid-solution toward arfvedsonite) is also observed with increasing sodium in the system. Mössbauer spectroscopy confirms the cation distribution provided by IR data, and shows that a small, but significant amount of Fe2+ occurs at M4 along the join. Infrared spectroscopy shows that the Li end-member has a very ordered structure, whereas intermediate compositions show local heterogeneities associated with the presence of two different B sites occupied by Na or Li.
Received: 2002-6-28
Accepted: 2003-3-1
Published Online: 2015-3-31
Published in Print: 2003-7-1
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- Bonding preferences of non-bridging O atoms: Evidence from 17O MAS and 3QMAS NMR on calcium aluminate and low-silica Ca-aluminosilicate glasses
- BNa–BLi solid-solution in A-site-vacant amphiboles: synthesis and cation ordering along the ferri-clinoferroholmquistite–riebeckite join
- A new uranyl carbonate sheet in the crystal structure of fontanite, Ca[(UO2)3(CO3)2O2](H2O)6
- XANES calibrations for the oxidation state of iron in a silicate glass
- Dissolution of strontianite at high P-T conditions: An in-situ synchrotron X-ray fluorescence study
- Intergrown niobian rutile phases with Sc- and W-rich ferrocolumbite: An electron-microprobe and Rietveld study
- Bulk moduli and high-pressure crystal structures of minium, Pb3O4, determined by X-ray powder diffraction
- Slow oxygen diffusion rates in igneous zircons from metamorphic rocks
- Chemistry of grain boundaries in mantle rocks
- Heats of mixing of silicate liquid in the systems diopside-anorthite-akermanite, diopside-anorthite-forsterite, and diopside-silica
- High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes
- Monte Carlo simulations of ordering of Al, Fe, and Mg cations in the octahedral sheet of smectites and illites
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- Dawsonite: An inclusion mineral in quartz from the Tin Mountain pegmatite, Black Hills, South Dakota
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