from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A glassy pink, green, violet, or blue aluminum borosilicate mineral, Al8BSi3O19OH, used in spark-plug ceramics and as imitation lapis lazuli.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A fibrous aluminium boro-silicate mineral that occurs in various colours.
from The Century Dictionary and Cyclopedia
- n. A silicate of aluminium of a bright-blue color, occurring in fibrous forms in the gneiss of Chaponost near Lyons, and elsewhere.
French, after Eugène Dumortier, 19th-century French paleontologist.(American Heritage® Dictionary of the English Language, Fourth Edition)
Eugene Dumortier (1803-1873), French palaeontologist, + -ite. (Wiktionary)