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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A monoclinic beryllium aluminium hydroxide silicate mineral, a product of the decomposition of beryl in pegmatites.

from the GNU version of the Collaborative International Dictionary of English

  • n. A brittle gem occurring in light green, transparent crystals, affording a brilliant clinodiagonal cleavage. It is a silicate of alumina and glucina.

from The Century Dictionary and Cyclopedia

  • n. A very brittle mineral of a pale-green color and high luster, crystallizing in prismatic crystals belonging to the monoclinic system.


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