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搜索结果: 1-15 共查到地质学 crystal-chemistry相关记录25条 . 查询时间(0.013 秒)
The paper summarizes crystalhemical data and describes the IMA-accepted nomenclature of lovozerite-group minerals(LGM). The lovozerite group includes nine zeolite-like cyclosilicates with the general...
Detailed X-ray single-crystal structure refinements and complete (SIMS + EMPA) microprobe chemical analyses of a series of non-metamict samples of hellandite recently found in Latium (Italy),together ...
Heretofore the nomenclature of axinites was very simple: the only name accepted by everybody was "axinite" itself, sometimes associated with the adjective "manganous". Since most, if not all, axinites...
Abstract: A synthetic octahedral-site-vacancy-free annite sample and its progressive oxidation, induced by heating in air, were studied by powder X-ray diffraction (pXRD), Mössbauer spectroscopy,...
Twokarrooitecrystals,onewithadisorderparameter(X TicontentintheM1site) of0.070(5)andtheotherwith X 0.485(5),weremountedtogetherinonediamond-anvil cellandstudiedbysingle-crystalX-raydiffractionatseve...
Phengitic muscovite-2 M1crystals [[12](K0.88 20.99Na0.01 20.09Ca0.00 20.06Ba0.00 20.01)[6](Al1.64 21.88Fe210.06 20.29Fe Mg0.00 20.16Mn0.00 20.07Ti0.00 20.06)[4](Si2.87 23.30Al0.70 21.13)(OH)1.56 22.07...
This study clarifies the crystal structure variations and relationships in the zeolites eri-onite and offretite. The crystal structure analyses used Rietveld analysis of X-ray powder diffraction data,...
Many known occurrences of the zeolites erionite and offretite have been characterized by electron probe microanalysis, X-ray powder diffraction, and optical microscopy. For the first time, a substanti...
Bamfordite from the abandoned W-Mo-Bi mines at Bamford, Queensland, Australia, is a new hydrated iron molybdate with a unique structure. This mineral formed by oxidation of molybdenite, MoS2, in the p...
ThestructuresoffourA MSi O (!nH O)silicates(A NaorK,M NdorY)recently3 6 15 2determinedbytheauthorsarecomparedwithoneanotherandwiththestructuresofrelated silicates.The2:5Si:Oratiointhesecompounds(sili...
Crystal-structurere?nementswereperformedonclintonite-1M crystals[idealcompo-sitionCa (Mg Al) (SiAl )O (OH) ]fromskarnsofthePredazzo-MonzoniareaandAdamelloMassif(northernItaly)withtheaimofcharacterizin...
Wepresenta?rst-principlesstudy(localdensityapproximation)ofthestructuralprop- ertiesofforsteriteunderpressure.Thishighlyanisotropicmagnesiumorthosilicateisthe mostabundantphaseoftheEarth!flsupperman...
Thealuminosilicategarnetbinariesalmandine-pyropeandalmandine-spessartinewerestudiedbypowderX-rayandFeMo!§ssbauermethods.Re?nementsoftheunit-cellcon stantsalongthealmandine-pyropejoinshowthatthevolume...
Single-crystalX-raydiffractiondatahavebeenobtainedforcrystalsoftheFanalogof superhydrousphaseB,MgSi O F .Twinnedcrystalsweresynthesizedusingasplit- sphereanvilapparatus(USSA-2000)atpressuresbetween1...
High-resolution neutron powder diffraction was used to study phase transitions in theleucite phases of KAlSi206, RbAlSi20", CsAlSi206, and KFeSi206. Thetemperature-depen-dent structural behavior invol...

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