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

  • n. A brown, gray, white, or pale green mineral, Al2SiO5, used as a gemstone and for ornamental carvings. Also called fibrolite.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A fibrous neosilicate mineral, polymorphic with andalusite and kyanite, with the chemical formula Al2SiO5.

from the GNU version of the Collaborative International Dictionary of English

  • n. Same as fibrolite.

from The Century Dictionary and Cyclopedia

  • n. A silicate of aluminium (Al2SiO5), having the same composition as andalusite and cyanite.


After Benjamin Silliman.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Named after American chemist and geologist Benjamin Silliman (1779-1864) in 1824. (Wiktionary)


  • Kyanite and its related mineral “cousins,” sillimanite and andalusite, are called polymorphs.


  • Relative to one another, kyanite forms in a lower temperature/higher pressure environment; andalusite forms in a lower temperature/lower pressure environment, and sillimanite forms in a higher temperature/higher pressure environment.


  • In the second phase, the company would expand the capacities for producing the existing minerals while taking up works to produce sillimanite flour, sintered sillimanite grains and other minerals in the fourth phase.

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