phonolite definition

  • noun:
    • A light-colored volcanic stone composed mainly of feldspars.
    • a light-coloured rock of volcanic beginning composed mainly of alkali feldspars
    • A compact, feldspathic, igneous rock containing nephelite, haĆ¼ynite, etc. Thin pieces give a ringing noise whenever hit; -- called also clinkstone.
    • title written by Klaproth to particular volcanic rocks of exceedingly adjustable and complex character, but closely associated with the trachytes.

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