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Crystal chemistry of the elbaite-schorl series
Abstract The crystal-chemistry of 13 elbaite-schorl tourmaline crystals from the Cruzeiro pegmatite (Minas Gerais, Brazil) was studied with a multi-analytical approach (SREF, EMPA, SIMS, MS).Expand
Behavior of cation vacancy in kenotetrahedral Cr-spinels from Albanian eastern belt ophiolites
Abstract The crystal chemistry of 17 Cr-spinels from the Albanian eastern belt ophiolites was studied by a multi-analytical approach (EMPA, MS, SREF), processing the data with a tested optimizationExpand
Kinetics of cation ordering in synthetic MgAl2O4 spinel
Abstract The time and temperature evolution of intracrystalline Mg-Al exchange in synthetic MgAl2O4 spinel was studied by single-crystal X-ray diffraction of quenched samples, with the aim ofExpand
Intersite distribution of Fe2+ and Mg in the spinel (sensu stricto)–hercynite series by singlecrystal X-ray diffraction
Abstract The influence of composition on Fe2+-Mg intracrystalline distribution was studied in eleven synthetic crystals belonging to the spinel (sensu stricto)-hercynite series (Mg1-yFe2+y)Al2O4,Expand
Cation ordering and structural variations with temperature in MgAl2O4 spinel: An X-ray single-crystal study
Abstract The equilibrium distribution of Mg and Al between the tetrahedral and octahedral sites of a flux grown, stoichiometric MgAl2O4 spinel was investigated between 600 and 1100 °C byExpand
Structural relaxation around Cr3+ and the red-green color change in the spinel (sensu stricto)-magnesiochromite (MgAl2O4-MgCr2O4) and gahnite-zincochromite (ZnAl2O4-ZnCr2O4) solid-solution series
Abstract Optical absorption spectra of flux-grown single crystals in the spinel s.s.-magnesiochromite and gahnite-zincochromite solid solutions were recorded with the aim of exploring variations inExpand
Influence of cation distribution on the optical absorption spectra of Fe3+-bearing spinel s.s.–hercynite crystals: evidence for electron transitions in VIFe2+–VIFe3+ clusters
Abstract Flux-grown Fe3+-bearing spinel s.s.–hercynite solid-solution crystals, (Mg1-yFe2+y)Al2O4 (0 < y≤ 1), have been investigated by means of electron microprobe technique and Mössbauer andExpand
Compositional variation of tourmaline in the granitic pegmatite dykes of the Cruzeiro mine, Minas Gerais, Brazil
Schorl-dravite and schorl-elbaite from different zones of the rare-element-enriched complex granitic pegmatite dykes of the Cruzeiro mine, in Minas Gerais, Brazil, were analyzed by electron and ionExpand
Raman fingerprint of chromate, aluminate and ferrite spinels
Synthetic and natural spinel single crystals having compositions closely approaching spinel end-members ZnCr2O4, MgCr2O4, FeCr2O4, ZnAl2O4, MgAl2O4, CoAl2O4, FeAl2O4, MnAl2O4, MgFe2O4, and FeFe2O4Expand
Crystal structure and iron topochemistry of erionite-K from Rome, Oregon, U.S.A.
Abstract A complete crystal-chemical characterization of erionite-K from Rome, Oregon, was obtained by combining field emission scanning electron microscopy, laboratory parallel-beam transmissionExpand