quartz porphyry


: 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

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Cite this Entry

“Quartz porphyry.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quartz%20porphyry. Accessed 17 Jul. 2024.

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