Porphyry (/ ˈ p ɔːr f ɪ r i / PORfihree) is a textural term for an igneous rock consisting of coarsegrained crystals such as feldspar or quartz dispersed in a finegrained silie rich, generally aphanitic matrix or larger crystals are called phenocrysts. In its nongeologic, traditional use, the term porphyry refers to the purplered form of this stone, valued for its ...
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