Definitions

from The Century Dictionary and Cyclopedia

  • n. In petrography, a prefix used with the name of a rock to form the name of an intermediate variety between trachyte and the rock named: as, trachyandesite, a lava intermediate in composition between traehyte and andesite; trachydolerite, a lava between trachyte and basalt, or having minerals characteristic of both rocks, basic plagioclase, orthoclase, pyroxene, and olivin. Trachyrhyolite is a lava intermediate between trachyte and rhyolite.

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