What is Tuff, Its Composition, Formation, and Uses?
Tuff or ash tuff is a pyroclastic rock with at least 75% volcanic ash. Volcanic ash are particles no more than 2 mm ejected during
Extrusive or volcanic
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
Basanite: A Fine-grained Mafic Volcanic Rock
Basanite is a fine-grained, dark-colored volcanic or extrusive igneous rock. Fine-grained means its grains are too small to see without a microscope. Compositionally, basanite is
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,
A Guide to Basalt: A Common, Fine-grained, Dark-Colored Volcanic Rock
Basalt is a hard, fine-grained, dark-colored volcanic or extrusive rock. It has primarily calcium-rich plagioclase and augite. Also, it may have minor amounts of other
Everything You Ought to Know about Andesite Rock
Andesite is a fine-grained, intermediate volcanic or extrusive igneous rock. Its composition lies between basalt and dacite, and it has mainly sodium-rich plagioclase and one
A Complete Guide to Rhyolite: A Common Light-colored Volcanic Rock
Rhyolite is a highly silicic, fine-grained, light-colored volcanic or extrusive igneous rock. It is a felsic rock with mainly quartz, alkali feldspar, plagioclase, and minor
How Do the Mystical Pele’s Hair Form?
Pele’s hair is a formal geological term that volcanologists give to the golden-brown, fiber or thread-like strands of volcanic glass formed naturally from blowing out