Definitions

from The Century Dictionary.

  • noun A mineral of a white or gray color and fibrous to columnar structure.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) A silicate of alumina, of fibrous or columnar structure. It is like andalusite in composition; -- called also sillimanite, and bucholizite.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy Sillimanite.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From its fibrous crystals.]

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