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Khmaralite, Ca Mg Fe Fe Al Be B Si O , is a new mineral closely related to.04 5.46 14.26 1.43 0.02 4.80 400.12 1.87sapphirine from Khmara Bay, Enderby Land, Antarctica. It occurs in a pegmatite metamo...
A thermodynamic model of non-convergent cation-ordering in karrooite (MgTi O ) has been cali-2 5 brated from the single-crystal X-ray structure refinements of Yang and Hazen (1998) and from esti- ma...
Non-convergent cation ordering in the (Fe O ) (MgAl O ) solid solution was investigated us- ing in-situ time-of-flight neutron powder diffraction. The approach to equilibrium in a sample with x = 0...
Thetemperaturedependenceofthecationdistributioninsyntheticspinel(MgAl O )was2 4 determinedusingin-situtime-of-?ightneutronpowderdiffraction.Neutrondiffractionpat- ternsofstoichiometricMgAl O andsli...
Theclustervariationmethod(CVM)fordeterminingthethermodynamicsofbothshort- rangeandlong-rangeorderinthisstudywasextendedtocomplexaluminosilicateminerals. Usingrecentlydevelopedalgorithmsforthemaximiz...
Twokarrooitecrystals,onewithadisorderparameter(X TicontentintheM1site) of0.070(5)andtheotherwith X 0.485(5),weremountedtogetherinonediamond-anvil cellandstudiedbysingle-crystalX-raydiffractionatseve...
29The SiMASNMRspectrumofarmenitefromWasenalp(Valais,Switzerland)indicates completeSi,Alordering.Thesamechemicalshifts(82.3,95.0,and101.8ppm)were alsomeasuredforarmenitefromRe!migny(Quebec,Canada),ho...
Infrared spectra of ordered (P2/n ) and disordered ( C2/c ) pyroxenes belonging to the join augite-jadeite were investigated at room temperature in the range 70–1400 cm 21. The spectra change as a fun...
Single-crystal and powder X-ray diffraction data were collected to characterize the mac-roscopic solid-solution and cation-ordering behavior in the system augite-jadeite (low ac-mite content). We exam...
Abstract: A combined powder X-ray diffraction (XRD) and X-ray absorption (XAS) study of Fe(III) cation ordering within pyroaurite is described. It is concluded that there is no correlation between Fe(...
Twoseriesofleucitegroupmaterials,withK,Rb,andCsasextra-frameworkcations,havebeensynthesizedbyionexchangefromanaturalwell-orderedanalciteandanatural29 27disorderedleucite.Siand AlMASNMRdatafortheanalci...
Theyoungestsamplehasparameterscorrespondingtonearlyunoxidizedtitanomagne- tite,whereastheoldestisnear-end-membertitanomaghemite.Intermediatesamplesare partiallyalteredbutdisplaynosuperstructurere?ec...
The crystal chemistry and structure ofthe layered lead oxychloride parkinsonite, ideally Pb7Mo09C12, have been reevaluated in the light of TEM observations of natural and syn-thetic samples and the st...
The effects of compositional changes and nonsymmetry-breaking AI-Siordering onthe displacive phase transition in anorthoclase have been studied using X-ray powder diffrac-tion. The results wereanalyze...
An imaging-plate detector interfaced to a large-volume high-pressure device allows quantitative in situ powder X-ray diffraction measurements at the National Synchrotron Light Source (NSLS). High-qual...

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