from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A glassy pink, green, violet, or blue aluminum borosilicate mineral, Al8BSi3O19OH, used in spark-plug ceramics and as imitation lapis lazuli.
from The Century Dictionary.
- noun A silicate of aluminium of a bright-blue color, occurring in fibrous forms in the gneiss of Chaponost near Lyons, and elsewhere.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
fibrous aluminium boro- silicate mineralthat occurs in various colours.
from The American Heritage® Dictionary of the English Language, 4th Edition
[French, after Eugène Dumortier, 19th-century French paleontologist.]
from Wiktionary, Creative Commons Attribution/Share-Alike License
Eugene Dumortier (1803-1873), French palaeontologist, + -ite.
X-ray diffraction investigation on the fibers yielded figures similarto the mineral dumortierite.