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Article: Reports from University of Paris add new data to research in mineralogy.
- Article from:
- Mining & Minerals
- Article date:
- October 9, 2009
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According to a study from Paris, France, "Two Ca-Zr-Ti oxides, zirconolite CaZrTi2O7 and calzirtite Ca2Zr5Ti2O16, Occur as Minute interstitial crystals in skarn (forsterite-spinel-calcite, with rhythmic banding) ejecta from the 1631 eruption of Vesuvius. The Substitutions in zirconolite observed here mainly include Nb-for-Ti (typical for zirconolites in alkaline magmatic Surroundings) and (Th,U)-for-Ca, and produce a crystal-chemical formula Ca0.9-1Th0.04-0.12U0.04-0.10ZrTi1.36-1.61Nb0.09-0.22(Fe,Mg,Al)(0.29-0.47)O-7."
"The skarn, which Occurs in contact with a pyroxenite of magmatic origin, displays a mineralogical zoning with Zr-, Ti-, Nb- and (U,Th)-rich ...
<2 m), whereas those oxides observed further from the pyroxenite (>