du·mor·ti·er·ite 
(d-môrtē-ə-rīt′, dy-)
(d-môrtē-ə-rīt′, dy-)n.
A glassy pink, green, violet, or blue aluminum borosilicate mineral, Al8BSi3O19OH, used in spark-plug ceramics and as imitation lapis lazuli.
[French, after Eugène Dumortier, 19th-century French paleontologist.]
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