Definitions

from The Century Dictionary and Cyclopedia

  • n. A silicate of aluminium and magnesium, dark-green in color, owing to the presence of protoxid of iron. The mineral is massive or fibrous, the fibers being in stellate groups.
  • n. In petrography, a term used by King (1878) to designate a group of volcanic rocks including both rhyolite and basalt.

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