from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See sillimanite.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Sillimanite.
from the GNU version of the Collaborative International Dictionary of English
- n. A silicate of alumina, of fibrous or columnar structure. It is like andalusite in composition; -- called also sillimanite, and bucholizite.
from The Century Dictionary and Cyclopedia
- n. A mineral of a white or gray color and fibrous to columnar structure.
From its fibrous crystals.(American Heritage® Dictionary of the English Language, Fourth Edition)