Mcnair, B.

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Home » Archives for Mcnair, B.

A Beginner’s Guide to Understanding Burial Metamorphism

Burial metamorphism is a low-grade regional metamorphism. It occurs when pressure and temperature cause minerals in deeply buried sedimentary and volcanic rocks to partially or

Home » Archives for Mcnair, B.

A Must-Read Comprehensive Guide to Norite Rock

Norite is a coarse-grained, dark-colored plutonic rock. It has mainly calcium-rich plagioclase (= labradorite to bytownite) and orthopyroxene (= hypersthene or enstatite) with minor hornblende,

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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

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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

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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

Grayish porphyritic dacite rock color, texture, and appearance - quartz appears glassy gray, plagioclase white, and biotite black. Photo credit: James St. John, CC BY 2.0, via Wikimedia Commons.

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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,

Monzonite rock color and texture and meaning

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What You Must Know about Monzonite Rocks

Monzonite is a coarse-grained, intermediate intrusive igneous rock. Its composition lies between diorite and syenite and has roughly equal amounts of plagioclase and alkali feldspar.

Grayish granodiorite rock with a coarse-grained phaneritic texture

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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.

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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,