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Distinctive properties of rock-forming blue quartz: inferences from a multi-analytical study of submicron mineral inclusions

  • W. Seifert (a1), D. Rhede (a1), R. Thomas (a1), H.-J. Förster (a1), F. Lucassen (a1), P. Dulski (a1) and R. Wirth (a1)...


The study discusses the mineralogical, geochemical and thermometric properties of rock-forming blue quartz from eight worldwide occurrences. Compared to non-blue quartz, blue quartz contains significant amounts of submicron-sized (1 μm—100 nm) and nanometre-sized (<100 nm) inclusions. Mica, ilmenite and rutile constitute the most abundant submicron-sized inclusions, and are formed probably by syngenetic precipitation in the boundary layer between quartz and melt (entrapment model). Nanometre-sized rutile possibly originated by epigenetic exsolution of Ti from the quartz structure (exsolution model). Rayleigh scattering of light by nano-particulate inclusions best explains the origin of the blue colour. Blue quartz is generally Ti-rich (∼100—300 ppm) and formed at high temperatures (∼700°C—900°C). The large number, and high spatial density, of tiny xenocrystic inclusions of Ti-bearing minerals make calculations of crystallization temperatures using the Ti-in-quartz thermometer unreliable. The geological significance of blue quartz remains obscure.


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Petrographic images of samples containing blue quartz

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Distinctive properties of rock-forming blue quartz: inferences from a multi-analytical study of submicron mineral inclusions

  • W. Seifert (a1), D. Rhede (a1), R. Thomas (a1), H.-J. Förster (a1), F. Lucassen (a1), P. Dulski (a1) and R. Wirth (a1)...


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