WebAn igneous rock of any composition that contains conspicuous phenocrysts in a fine-grained groundmass; a porphyritic igneous rock. The term (from a Greek word for a purple dye) …
GemRocks: Porphyry - Central Michigan University
WebThe name Porphyry comes from the ancient Greek meaning purple, a color frequently found in this type of rock, along with red, brown and grey. It is this rock that has inspired the … • Porphyry (geology), an igneous rock with large crystals in a fine-grained matrix, often purple, and prestigous Roman sculpture material • Porphyritic, the general igneous texture of a rock with two distinct crystal (phenocryst) sizes • Porphyry copper deposit, a primary (low grade) ore deposit of copper, consisting of porphyry rocks literary fluency
Porphyria - Symptoms and causes - Mayo Clinic
WebApr 5, 2024 · Symptoms of acute porphyrias may include: Severe pain in the belly, chest, legs or back. Digestive problems, such as constipation, nausea and vomiting. Muscle pain, … WebJun 24, 2005 · It is an altered andesite porphyry that consists of a dark reddish purple aphanitic groundmass plus relatively small white and flesh colored andesine (plagioclase feldspar) phenocrysts. The reddish purple … Porphyry is the name given to decorative granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass. The larger crystals are called phenocrysts. In its non-geologic, traditional use, the term porphyry usually … See more Most igneous rocks have some degree of porphyritic texture. This is because most magma from which igneous rock solidifies is produced by partial melting of a mixture of different minerals. At first the mixed melt slowly cools … See more In countries where many automobiles have studded winter tires such as Sweden, Finland, and Norway, it is common that highways are paved … See more • Pictures of the Mons Porphyrites, Red Sea, Egypt. • Rhomb porphyry lavas at the Wayback Machine (archived May 20, 2008) • Flash showing rhomb porphyry formation at the Wayback Machine (archived December 24, 2007) See more Antiquity and Byzantium To the Romans it was known as Lapis porphyrites. Pliny the Elder's Natural History (36, 11) affirmed … See more • List of rock textures – List of rock textural and morphological terms • Quartz-porphyry – Type of volcanic rock containing large porphyritic crystals … See more importance of snow to global precipitation