Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Metamorphic rock having porphyritic texture.

from The Century Dictionary and Cyclopedia

  • n. A sedimentary rock, originally (in some cases at least) a clay slate, or quartzite, which has been altered by dynamic metamorphism or by some other metamorphic agency so as to take on a slaty and more or less perfectly developed porphyritic structure.

Etymologies

Sorry, no etymologies found.

Examples

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.