Quartz-porphyry
Type of volcanic rock containing large porphyritic crystals of quartz / From Wikipedia, the free encyclopedia
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Quartz-porphyry, in layman's terms, is a type of volcanic (igneous) rock containing large porphyritic crystals of quartz.[1][2] These rocks are classified as hemi-crystalline acid rocks.
![]() | This article is largely based on an article in the out-of-copyright Encyclopædia Britannica Eleventh Edition, which was produced in 1911. (July 2016) |