We have moved all content for this concept to for better organization. The basic classification is the same as for plutonic rocks: with increasing silica content, they include: basalt, … What is Basalt? Pumice (texture) vesicular. Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. Determination of intrusive and extrusive igneous rocks. Pumice, obsidian, and basalt are all extrusive igneous rocks. Extrusive rocks erupt from volcanoes or seafloor fissures, or they freeze at shallow depths. Diorite(intrusive or extrusive) Intrusive. This occurs when magma bursts forth from the mantle or crust on to the surface. Intrusive means its below the earth's surface(in the ground) The first 3 are also volcanic rocks, a couple forming in the event of an eruption (obsidian and pumice). Depending on where and how the magma cools, igneous rocks are described as either intrusive or extrusive. Extrusive rocks are rocks that have formed on the surface of the earth. Intrusive Rocks Igneous rocks which form by the crystallization of magma at a depth within the Earth are called intrusive rocks. By contrast, intrusive rocks are formed from magma that was forced into older rocks at depth within Earth’s crust; the molten material then slowly solidifies below Earth’s surface, where it may later be exposed through erosion. Gabbro and basalt are both igneous rocks. Please update your bookmarks accordingly. Great globs of molten rock rise toward the surface. This generally happens in volcanic areas, when volcanoes erupt or ooze magma. Rhyolite (intrusive or extrusive) extrusive. Intrusive rocks are characterized by large crystal sizes, i.e., their visual appearance shows individual crystals interlocked together to form the rock mass. Therefore, they are typically fine-grained and gassy. Scoria (type of crust/plate tectonic setting) continental, convergent. Intrusive igneous rock Intrusive, or plutonic igneous rock forms when magma is trapped deep inside the Earth. Image credit: Yes058/Shutterstock.com. vesicular Basalt (intrusive or extrusive) extrusive. This means that they cool relatively quickly and under low pressures. Diorite(minerals/color) felsic/intermediate. basalt-exrusive obsidian-extrusive pumice-extrusive granite-Intrusive Extrusive means its on the surface (on the ground). 2) Extrusive rocks or Volcanic rocks When magma does reach the surface during a volcanic eruption, the rocks that form there are called lavas or volcanic rocks. This means it's formed through the cooling and solidification of magma or lava. Basalt (color/mineral) dark/mafic. Igneous rocks — those which originate from magma — fall into two categories: extrusive and intrusive. Basalt is a common extrusive igneous (volcanic) rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon. 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