from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A mixed aluminate of sodium, magnesium and aluminium that has a characteristic blue colour, and exhibits pleochroism, with the chemical formula Na2(Mg,Fe2+)3Al2Si8O22(OH)2.

from the GNU version of the Collaborative International Dictionary of English

  • n. A mineral of a dark bluish color, related to amphibole. It is characteristic of certain crystalline rocks.

from The Century Dictionary and Cyclopedia

  • n. A bluish or bluish-black mineral belonging to the amphibole or hornblende family, containing 7 per cent, of soda. It is a characteristic constituent of certain crystalline schists.


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