Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Kyanite.

from the GNU version of the Collaborative International Dictionary of English

  • n. Cyanite or kyanite; -- so called in allusion to its unequal hardness in two different directions. See cyanite.

from The Century Dictionary and Cyclopedia

  • n. Cyanite: a mineral so called by Haüy on account of its unequal hardness, and because its crystals have the property of being electrified both positively and negatively.

Etymologies

Ancient Greek twice + force: compare French disthène. So called in allusion to its unequal hardness in two different directions. (Wiktionary)

Examples

  • On the west of the second range we have great masses of kyanite or disthene, and on the flanks of the third and fourth a great deal of specular iron ore which is magnetic, and containing a very large percentage of the metal.

    Missionary Travels and Researches in South Africa

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