QUARTZ PORPHYRY


Meaning of QUARTZ PORPHYRY in English

noun

: a porphyritic extrusive or dike rock in which quartz with more or less corroded crystals and orthoclase and usually mica, amphibole, or pyroxene occur as phenocrysts in a groundmass that is felsophyric, granophyric, or vitrophyric

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.