phonolite

(nə līt′)

noun

a fine-grained, extrusive igneous rock consisting chiefly of alkali feldspar and nepheline

Origin: Fr phonolithe < phono- (see phono-) + -lithe (see -lite): transl. of Ger klingstein < klingen, to ring, clink + stein, stone

Related Forms:

See phonolite in American Heritage Dictionary 4

noun
A light-colored volcanic rock composed largely of feldspars.

Related Forms:

  • phoˌno·litˈic (-lĭtˈĭk) adjective
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