Felsic and Mafic Rock and Mineral Differences
Felsic and mafic are field terms we use to classify igneous rocks, their magma, or lava. This classification is based on their mineral composition, i.e.,
Felsic
Felsic Rock Composition and Examples
Felsic describes rocks, magma, or lava high in silica and felsic minerals. Felsic minerals are rock-forming silicates high in silicon, oxygen, aluminum, potassium, and sodium.
Ignimbrite Appearance and Formation
An ignimbrite or ash-flow tuff is a type of volcanic rock formed from pyroclastic flow deposits. It has poorly sorted pumice fragments, scattered lithic fragments,
Understanding Trachyte, a Fine-grained Volcanic Rock
Trachyte is fine-grained, usually light-colored volcanic or extrusive igneous rock. It has an intermediate composition with its essential alkali feldspar, lesser plagioclase, and minor mafic
What Is Rhyodacite Rock Composition and How Does It Form?
Rhyodacite is a fine-grained, light-colored volcanic or extrusive rock. This felsic rock has mainly plagioclase, quartz, alkali felspar, and smaller amounts of mafic minerals. The
Dacite: A Fine-grained, Light-Colored Volcanic Rock
Dacite is a fine-grained, light-colored volcanic or extrusive igneous rock. Its composition is felsic and mainly has plagioclase feldspar, quartz, lesser alkali feldspar, minor hornblende,
What Experts Will Tell You about Granodiorite Rock
Granodiorite is a coarse-grained, light-colored plutonic rock. It has mainly plagioclase, quartz, lesser alkali feldspar, and minor amounts of mafic minerals like mica and amphibole.
Tonalite: Key Things to Learn this Granitoid
Tonalite is a coarse-grained, light-colored, plutonic or intrusive rock. Its composition is mainly plagioclase, quartz, and small amounts of biotite, hornblende, and sometimes pyroxenes. Also,
A Geologist’s Definitive Guide to Granite Rock
Granite is a coarse-grained, light-colored, plutonic, or intrusive igneous rock. It is dominated by alkali feldspar, quartz, and plagioclase, with other minerals like amphibole, mica,