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dumortierite Line breaks: du|mor¦tier|ite
Pronunciation: /djʊˈmɔːtɪərʌɪt/

Definition of dumortierite in English:


[mass noun]
A rare blue or violet mineral occurring typically as needles and fibrous masses in gneiss and schist. It consists of an aluminium and iron borosilicate.
Example sentences
  • Little known from the east coast, important deposits of dumortierite exist in Rochester and Oreana, Nevada.
  • Beautiful blue semi-precious dumortierite nuggets are accented by sparkling 8mm clear Swarovski crystals.
  • Detrital dumortierite infrequently has been found in the heavy mineral fraction of sediments.


Late 19th century: from the name of V.-E. Dumortier (1802–76), French geologist, + -ite1.

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Pronunciation: fɔːˈtɪsɪməʊ
(especially as a direction) very loud or loudly