Rocks Archives - Geology Degree

6 Best Quartzite Sealers – Best of 2023

Tammy — Sat, 11 Feb 2023 10:48:28 +0000

Quartzite is a natural stone and a famous choice for countertops, roofing, flooring, and stairs. It is a porous material that requires sealing annually or more often if installed in a high-traffic area. Natural stone sealers are commonly available online and in hardware supplies stores. However, the problem comes when you don’t know how to ... Read more

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Limestone Rock Type, Composition, Formation, & Uses

Tammy — Mon, 28 Nov 2022 08:56:44 +0000

Limestone is a non-clastic sedimentary rock consisting of more than 50% calcite (a calcium carbonate mineral, CaCO3). Limestone is mostly a biological rock that forms in clear, warm, and shallow marine waters. Limestone exists in various types and colors. Its composition varies slightly from one reserve to another, but all types contain calcium carbonate as ... Read more

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Basalt Rock Type, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:37:54 +0000

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

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Dacite Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:37:26 +0000

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

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Diorite Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:37:04 +0000

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

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Gabbro Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:35:14 +0000

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

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Obsidian Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:34:52 +0000

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

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Pegmatite Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:34:45 +0000

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

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Peridotite Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:34:38 +0000

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

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Pumice Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:34:18 +0000

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

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