Porphyry (/ ˈpɔːrfəri / POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate -rich, generally aphanitic …

Nov 5, 2012 · Porphyry is an igneous rock with large crystals in a fine groundmass. Discover how these textures develop and where porphyritic rocks form.

Sep 2, 2022 · Porphyry (pronounced as POR-fə-ree) describes any intrusive or extrusive igneous texture rock with large-grained crystals embedded in a finer-grain matrix. The finer-grained …

May 8, 2024 · Porphyry refers to igneous rocks with large, well-formed crystals in a finer-grained matrix common in andesite, basalt, rhyolite, or granite.

They commonly have a porphyritic texture, i.e., larger crystals within a finer-grained groundmass, indicating two periods of crystallization. (A porphyry is an igneous rock containing conspicuous …

Porphyry is a variety of igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic [1] matrix or groundmass.

Jun 24, 2005 · DESCRIPTION: Porphyry is the term geologists apply to igneous rocks that consist of relatively large grains or crystals, called phenocrysts, surrounded by a finer grained …

Not a root name, but a texturally-based name for any rock with coarse phenocrysts in a finer groundmass. Most commonly used for felsic rocks such as rhyolites, granites, etc.

Porphyry is less of a single rock and more of a category - it's used to refer to igneous rocks with large, distinguishable grains intermixed with many tiny grains. One porphyry variety found …

The porphyritic texture is a type of texture occurring in volcanic and intrusive igneous rocks defined by the presence of larger crystals, called phenocrysts, surrounded by a matrix of …