Porphyritic - Wikipedia Porphyritic is an adjective used in geology to describe igneous rocks with a distinct difference in the size of mineral crystals, with the larger crystals known as phenocrysts
What is a Porphyritic Texture and How Is It Formed? The porphyritic texture is an igneous rock texture characterized by well-formed, larger crystals in a finer-grained matrix The consistently larger crystals are known as phenocrysts, while the finer-grained matrix is known as groundmass
Porphyritic – Geology is the Way 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 considerably smaller crystals or igneous glass, called groundmass
Porphyry - Igneous Rocks - Sandatlas Porphyry is an igneous rock characterized by porphyritic texture Porphyritic texture is a very common texture in igneous rocks in which larger crystals (phenocrysts) are embedded in a fine-grained groundmass
What Is Porphyritic Texture in Rocks and How Does It Form Porphyritic rocks form from two-stage cooling when crystallization starts outside the eutectic composition or when minerals crystallize and nucleate at different rates Also, this texture can result in sudden loss of water-rich fluids or volatiles
Porphyry Deposits - Geology Science Porphyry deposits are a type of mineral deposit that form from large-scale hydrothermal systems associated with intrusive igneous rocks They are characterized by the presence of porphyritic rocks that contain large crystals (phenocrysts) surrounded by a fine-grained matrix (groundmass)
Porphyry | geological feature | Britannica 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 crystals, called phenocrysts, surrounded by a matrix of finer-grained minerals or glass or both )
Porphyry (geology) - Wikipedia 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 matrix or groundmass
The Textures of Igneous Rocks – Geology In There are six main types of igneous textures; Phaneritic, Aphanitic, Porphyritic, Glassy, Pyroclastic and Vesicular Phaneritic texture is a characteristic of igneous rocks that have visible crystals that can be seen with the naked eye