Alma Farley, 32 years old
Rutilethe most abundant of three naturally occurring forms of titanium dioxide TiO 2 ; see also anatase ; brookite. It forms red to reddish brown, hard, brilliant metallic, slender crystals, often dating rutile surrounded by other minerals. Rutile is a commercially important dating rutile mineral, although most titanium dioxide is produced from ilmenite. Rutile has minor uses in porcelain and glass manufacture as a colouring agent and in making some steels and copper alloys.
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Spot dating of detrital zircon is now routinely dating rutile for provenance work and recently pitfalls of this approach have been published. Zircon, because of its robustness, tends to preserve the age of the igneous event from which it crystallized, and not ensuing metamorphisms that it might have experienced. An advantage of rutile dating is its distain of Th. Essentially if Pb is detected, it is common, and with a model composition, common Pb can be accurately corrected for even if measurement of Pb is not possible. In addition concentrations of Ti and 11 trace elements are measured during dating analysis. Some trace elements Cr, V, and Zr show strong correlation with age.