Mcnair, B.

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Home » Archives for Mcnair, B.

How Does a Pahoehoe Lava Flow Form and Transition?

Pahoehoe or ropy lava flow is one of the subaerial lava flows, characterized by a smooth, ropy, gently undulating, or hummocky continuous chilled surface or

Dark gray gabbro rock from Duluth Complex, Minnesota, USA

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Gabbro: A Coarse-grained, Dark-Colored Plutonic Rock

Gabbro is a dense, coarse-grained, dark-colored, mostly plutonic rock. Its essential minerals are calcic plagioclase and pyroxene, but it may have minor amounts of amphibole,

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Kimberlite: A Rare, Brecciated Diamond Bearing Mantle Rock

Kimberlite is a potassic to ultrapotassic ultramafic rock with inequigranular texture. It is a rare type of peridotite with many xenoliths and xenocrysts, including, on

Greenish, coarse-grained peridotite rock

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Peridotites: Dense, Coarse-Grained Ultramafic Intrusive Igneous Rocks

Peridotites are dense, coarse-grained, dark-colored ultramafic plutonic rocks with at least 40% olivine by volume. Members are dunite, kimberlite, harzburgite, wehrlite and lherzolite. Others are

Nepheline syenite rock composition and appearance

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A Detailed Guide into Nepheline Syenite Rocks

Nepheline syenite is a coarse-grained, pale-colored (white, gray, or pinkish) intrusive igneous rock that resembles granite. Its chemical composition is intermediate to felsic and has

Syenite rock colors and mineral composition

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Syenite: A Coarse-grained Granite-Like Plutonic Rock

Syenite is a coarse-grained, mostly light-colored intrusive rock with an intermediate to felsic composition. It has mainly alkali feldspar, lesser plagioclase, and one or more

Grayish andesite with a fine-grained texture

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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

Salt and pepper (black and white) appearance of diorite rock picture

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Diorite: A Salt-and-Paper Looking Coarse-Grained Rock

Diorite is a coarse-grained, intermediate plutonic, or intrusive igneous rock. It has mainly plagioclase feldspar, biotite, hornblende, sometimes pyroxenes, and other minerals. This rock’s composition

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Dunite: A Coarse-grained, Olivine-rich Greenish Plutonic Rock

Dunite is a coarse-grained, pale green to olive-green, ultramafic intrusive igneous rock with more than 90% olivine. It also may have smaller amounts of pyroxene,