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.

    • ‘Little known from the east coast, important deposits of dumortierite exist in Rochester and Oreana, Nevada.’
    • ‘Blue quartz, also called dumortierite, is a stone of order that can enhance organizational abilities, self-discipline, and orderliness.’
    • ‘Although dumortierite has a reputation for being difficult to polish, we have found it works easily and polishes well with diamond.’
    • ‘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, + -ite.