Titanite (CaTiSiO5) is a common mineral in calc-silicates, metamorphosed igneous rocks, and calc-alkaline plutons. The mineral was first named by Martin Klaproth in 1795 for its high content of the element titanium, which had been discovered only a few years prior, and named by Klaproth for the Titans of Greek mythology. The alternate name sphene was proposed by Rene Haüy in 1801 for the mineral’s characteristic wedge-shape (sphenos in Greek means “wedge”), but in 1982 the IMA recommended that the name titanite be used in technical writing. The name sphene is still used in the gem industry, and...

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