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 (do͞o-môr′tē-ə-rīt′, dyo͞o-)
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.]


(Minerals) a hard fibrous blue or green mineral consisting of hydrated aluminium borosilicate. Formula: Al7O3BO3(SiO4)3
[C19: named after Eugène Dumortier, 19th-century French palaeontologist who discovered it]
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Tucson 2015: exceptional colored stones and gem artistry, Brazilian Cu-bearing tourmaline and emerald, Oregon sunstone and pearl market updates * Conference reports * Amblygonitemontebrasite carving * Moroccan amethyst * Dumortierite in quartz * Jadeite with high albite content * Moldavite imitation * Iridescent scapolite * Composite quartz beads * CVD synthetic diamond with unstable color * The Foldscope.
The Ambatofinandrahana region is most famous for quartz with and without inclusions, epitactic hematite on rutile, bastnasite, tourmaline and beryl, including huge crystals of aquamarine, with dumortierite crystals, encased in solid pegmatite.
Saul bought some of de Souza's crystals, at that time labeled as dumortierite, and sent them to a number of people for a proper identification.