Igneous Rocks Type, Formation, Classification & Uses https://geologydegree.org/rocks/igneous/ All about Geology Degrees Mon, 28 Nov 2022 12:13:12 +0000 en-US hourly 1 https://wordpress.org/?v=6.1.3 https://geologydegree.org/wp-content/uploads/2022/11/favicon-11.ico Igneous Rocks Type, Formation, Classification & Uses https://geologydegree.org/rocks/igneous/ 32 32 Basalt Rock Type, Formation, Occurrence & Uses https://geologydegree.org/basalt/ https://geologydegree.org/basalt/#respond Mon, 28 Nov 2022 06:37:54 +0000 https://geologydegree.org/?p=1584 Basalt belongs to volcanic igneous rocks family. It is a dark-colored (black, dark green or brown) rock with a fine-grained outlook. Basalt is the most common rock found on earth’ crust. Basalt’s composition is similar to gabbro but gabbro is a coarse-grained rock. Rock Composition The silica (SiO2) content in Basalt is 45%-52%. It also ... Read more

The post Basalt Rock Type, Formation, Occurrence & Uses appeared first on Geology Degree.

]]> https://geologydegree.org/basalt/feed/ 0 Dacite Rock Type, Composition, Formation, Occurrence & Uses https://geologydegree.org/dacite/ https://geologydegree.org/dacite/#respond Mon, 28 Nov 2022 06:37:26 +0000 https://geologydegree.org/?p=1603 Dacite is a volcanic igneous rock. It is a fine-grained rock that is normally light in color and is often considered a quartz-bearing variety of andesite. Rock Composition Dacite is often considered a fine-grained equivalent of granodiorite. It has a generalized mineral composition between rhyolite and andesite. Dacite has more quartz than andesite and more ... Read more

The post Dacite Rock Type, Composition, Formation, Occurrence & Uses appeared first on Geology Degree.

]]> https://geologydegree.org/dacite/feed/ 0 Diorite Rock Type, Composition, Formation, Occurrence & Uses https://geologydegree.org/diorite/ https://geologydegree.org/diorite/#respond Mon, 28 Nov 2022 06:37:04 +0000 https://geologydegree.org/?p=1618 Diorite is a coarse-grained intrusive igneous rock. Its composition is in-between granite and basalt. The rock is usually found as large intrusions, dikes, and sills. Rock Composition Diorite is composed of silicate minerals like plagioclase feldspar (typically andesine), biotite, hornblende, and/or pyroxene. Diorite may also contain trace amounts of microcline, quartz, and olivine. Sulfides, zircon, ... Read more

The post Diorite Rock Type, Composition, Formation, Occurrence & Uses appeared first on Geology Degree.

]]> https://geologydegree.org/diorite/feed/ 0 Gabbro Rock Type, Composition, Formation, Occurrence & Uses https://geologydegree.org/gabbro/ https://geologydegree.org/gabbro/#respond Mon, 28 Nov 2022 06:35:14 +0000 https://geologydegree.org/?p=1628 Gabbro is an intrusive igneous rock with a black or dark-green appearance. The term “Gabbro” was first used in the 1760s to name a newly discovered rock found in ophiolites of the Apennine Mountains in Italy. The rock was named after Gabbro, a hamlet near Rosignano Marittimo in Tuscany, Italy. A famous German geologist, Christian ... Read more

The post Gabbro Rock Type, Composition, Formation, Occurrence & Uses appeared first on Geology Degree.

]]> https://geologydegree.org/gabbro/feed/ 0 Obsidian Rock Type, Composition, Formation, Occurrence & Uses https://geologydegree.org/obsidian/ https://geologydegree.org/obsidian/#respond Mon, 28 Nov 2022 06:34:52 +0000 https://geologydegree.org/?p=1644 Obsidian is an igneous rock. It is an amorphous material, commonly known as a mineraloid. The rock is formed when molten rock material cools so rapidly that atoms don’t get time to arrange themselves in a crystalline structure. It results in volcanic glass with a smooth and uniform texture that breaks with a conchoidal feature. ... Read more

The post Obsidian Rock Type, Composition, Formation, Occurrence & Uses appeared first on Geology Degree.

]]> https://geologydegree.org/obsidian/feed/ 0 Pegmatite Rock Type, Composition, Formation, Occurrence & Uses https://geologydegree.org/pegmatite/ https://geologydegree.org/pegmatite/#respond Mon, 28 Nov 2022 06:34:45 +0000 https://geologydegree.org/?p=1653 Pegmatite is a coarse-grained igneous rock that contains large crystals and minerals typically not found in other types of rocks. The name pegmatite is not given due to mineral composition but due to the size of the crystals in the rock. Most pegmatite rocks contain crystals that are at least 1 centimeter big. Some pegmatite ... Read more

The post Pegmatite Rock Type, Composition, Formation, Occurrence & Uses appeared first on Geology Degree.

]]> https://geologydegree.org/pegmatite/feed/ 0 Peridotite Rock Type, Composition, Formation, Occurrence & Uses https://geologydegree.org/peridotite/ https://geologydegree.org/peridotite/#respond Mon, 28 Nov 2022 06:34:38 +0000 https://geologydegree.org/?p=1659 Peridotite is a group of dense and coarse-grained ultramafic igneous rocks. The rock group contains kimberlite. The group can also contain chromite or diamonds. It is the dominant rock of the upper part of the earth’s mantle. The rock mostly represents the earth’s mantle than the crust. Peridotite rocks are green, mainly due to their ... Read more

The post Peridotite Rock Type, Composition, Formation, Occurrence & Uses appeared first on Geology Degree.

]]> https://geologydegree.org/peridotite/feed/ 0 Pumice Rock Type, Composition, Formation, Occurrence & Uses https://geologydegree.org/pumice/ https://geologydegree.org/pumice/#respond Mon, 28 Nov 2022 06:34:18 +0000 https://geologydegree.org/?p=1665 Pumice is an igneous rock that has a light-colored and extremely porous appearance. It has been used in various industries for centuries. The rock is known as pumicite in its powdered or dust form. The rock is made up of highly vesicular rough textured volcanic glass. The rock may or may not contain crystals. The ... Read more

The post Pumice Rock Type, Composition, Formation, Occurrence & Uses appeared first on Geology Degree.

]]> https://geologydegree.org/pumice/feed/ 0 Rhyolite Rock Type, Composition, Formation, Occurrence & Uses https://geologydegree.org/rhyolite/ https://geologydegree.org/rhyolite/#respond Mon, 28 Nov 2022 06:34:07 +0000 https://geologydegree.org/?p=1672 Rhyolite is an extrusive igneous rock with a high silica concentration. The rock is usually pink or gray. The grains on the rock surface are so small that it is difficult to observe them without a hand lens. A typical rhyolite rock specimen has numerous extremely small vugs (cavities in rock lined with mineral crystals) ... Read more

The post Rhyolite Rock Type, Composition, Formation, Occurrence & Uses appeared first on Geology Degree.

]]> https://geologydegree.org/rhyolite/feed/ 0 Scoria Rock Type, Composition, Formation, Occurrence & Uses https://geologydegree.org/scoria/ https://geologydegree.org/scoria/#respond Mon, 28 Nov 2022 06:33:55 +0000 https://geologydegree.org/?p=1679 Scoria is a porous and dark-colored igneous rock that may or may not contain crystals. The usual color of scoria is dark brown, black, and dark purple with a hint of red in it. Scoria is often confused with pumice. Pumice is another famous porous rock with large vesicles and thicker vesicle walls and is ... Read more

The post Scoria Rock Type, Composition, Formation, Occurrence & Uses appeared first on Geology Degree.

]]> https://geologydegree.org/scoria/feed/ 0