Crystal Chemistry and Structure of Anomalous Birefringent Cubic Uvarovite Garnet, Ideally Ca3Cr2Si3O12

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atmire.migration.oldid5714
dc.contributor.advisorAntao, Sytle
dc.contributor.authorSalvador, Jeffrey
dc.contributor.committeememberPattison, David
dc.contributor.committeememberSpencer, Ronald
dc.date.accessioned2017-06-29T21:15:00Z
dc.date.available2017-06-29T21:15:00Z
dc.date.issued2017
dc.date.submitted2017en
dc.description.abstractAnomalous birefringent uvarovite (Uv) garnets from the Ural Mountains, Russia (SAR-1, SAR-2, and SKR-1), Zermatt, Switzerland (STZ-1), Jacksonville, Tuolumne County, California (JTC-1), and Outokumpu, Finland (FIN-1) were analyzed using synchrotron high-resolution powder X-ray diffraction (HRPXRD) and electron microprobe analysis (EMPA) in order to understand the crystal chemistry and structure that causes the occurrence of optical anisotropy. HRPXRD detected the existence of fine scale intergrowths of two (SAR-2, STZ-1, and JTC-1), three (SAR-1), and up to four (FIN-1) additional cubic phases of Uv, with slight changes in the a unit-cell parameter representative of distinct chemical compositional phases obtained by EMP analyses. The a unit-cell parameter ranges from 11.91425(2) Å in SAR-1b to 12.05305(2) Å in JTC-4a and based on the garnet end-member composition, uvarovite ranges from Uv9Adr88Grs2 in JTC-4a to Uv71Grs24Sps1 in FIN-6a. Rietveld refinement X-ray diffraction traces show no deviation from cubic symmetry and reveal consistent peak profiles with the appearance of broadening and asymmetrical peak effects caused by the existence of additional microscopic cubic uvarovite phases intergrown together. These multiphase intergrowths contain strain derived from lattice mismatch of slightly different a unit-cell parameters against boundary contacts between phases and ultimately give rise to the observed birefringence in uvarovite, and possibly to other garnet end-member species.en_US
dc.identifier.citationSalvador, J. (2017). Crystal Chemistry and Structure of Anomalous Birefringent Cubic Uvarovite Garnet, Ideally Ca3Cr2Si3O12 (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/25496en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/25496
dc.identifier.urihttp://hdl.handle.net/11023/3906
dc.language.isoeng
dc.publisher.facultyGraduate Studies
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subjectGeology
dc.subjectMineralogy
dc.subject.otherUvarovite
dc.titleCrystal Chemistry and Structure of Anomalous Birefringent Cubic Uvarovite Garnet, Ideally Ca3Cr2Si3O12
dc.typemaster thesis
thesis.degree.disciplineGeology and Geophysics
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
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