Porphyry (/ / POR -fə-ree) 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.
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- "Imperial Porphyry" from the Red Sea Mountains of Egypt. A waterworn cobble of porphyry. Rhyolite porphyry from Colorado; scale bar in lower left is 1 cm (0.39 in).
- Porphyry is a term that describes extrusive or intrusive igneous rocks with large-grained crystals embedded in a finer-grain matrix.
- You can use the terms porphyry and porphyritic to refer to any igneous rock with large mineral grains set in a fine-grained matrix.
- Geology: Porphyry deposits are associated with intrusive igneous rocks, such as granites and diorites.
- Sometimes it is assumed that porphyry is granitic in composition 1 while other sources claim that composition plays no role whatsoever2.
- Porphyry is a textural term for an igneous rock consisting of large-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate rich...
- Porphyry copper deposits are generally composed of a “plug-like” igneous intrusion – a large magma body that is emplaced beneath a volcanic system.
- Ore minerals occur as disseminations and in stockworks of veins in hydrother-mally altered, shallow intrusive complexes, often porphyritic, and in adjacent...
- A compilation of exploration discovery methods highlights the importance of historic workings in addition to geochemistry and geology as an initial vector...
