By quantity, these are the by far most common rock types. Granite has a lot of different colors ranging from white to pink. The specimen shown here is about two inches (five centimeters) across. Which graph best represents the textures of granite, pegmatite, and rhyolite? 1) Intrusive rocks or Plutonic rocks When magma never reaches the surface and cools to form intrusions (dykes, sills etc) the resulting rocks are called plutonic. Tell students to remove the rocks (A-F) from the box. Scientists can classify rocks as fine-grained or coarse-grained. Intrusive vs Extrusive Rocks The key difference between intrusive and extrusive rocks is that the intrusive rocks are formed from magma whereas the extrusive rocks are formed from lava. Extrusive rocks are rocks that have formed on the surface of the earth. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at Earth’s surface. PEGMATITE > intrusive / extrusive AND felsic, intermediate, mafic or ultramafic DUNITE>intrusive / extrusive AND felsic, intermediate, mafic or ultramafic BASALTIC GLASS>intrusive / extrusive AND felsic, intermediate, mafic or ultramafic in … There are two basic types: 1) intrusive igneous rocks such as diorite, gabbro, granite and pegmatite that solidify below Earth's surface; and 2) extrusive igneous rocks such as andesite, basalt, obsidian, pumice, rhyolite and scoria that solidify on or above Earth's surface. This is typical of pegmatites. Basalt is a common extrusive igneous rock formed by the rapid cooling of basaltic lava exposed at or very near the surface of Earth. Granite is a common intrusive rock. Lava emerging from a volcano contains often a fair bit of high pressure gas. Porphyritic rocks may be aphanites or extrusive rock, with large crystals or phenocrysts floating in a fine-grained groundmass of non-visible crystals, as in a porphyritic basalt, or phanerites or intrusive rock, with individual crystals of the groundmass easily distinguished with the eye, but one group of crystals clearly much bigger than the rest, as in a porphyritic granite. 1/23/2017 Igneous Rocks Flashcards | Quizlet 1/5 25 terms LieselMorgan Igneous Rocks What is the difference between intrusive and extrusive igneous rocks? An igneous rock is either an intrusive or extrusive rock and can have one or a multiple variety of minerals within it. ... Pegmatite dikes comprise extremely coarse crystalline granitic rocks—often associated with late-stage granite intrusions or … Pegmatite is an extremely coarse-grained intrusive igneous rock composed of large interlocking crystals. If the intrusive rock cooled underground but near the surface, it is called subvolcanic or hypabyssal, and often has visible, but tiny mineral grains. Igneous rocks are those that form via the process of melting and cooling. Is Granite an Intrusive or Extrusive Rock. More Details All magma develops underground, in the lower crust or upper mantle, because of the intense heat there.. Igneous rocks can have many different compositions, depending on the magma they cool from. The molten rock will crystalize and solidify giving the two basic groups of igneous rocks called Intrusive, formed under the earth, and Extrusive, formed above the earth Topaz on albite: A crystal of imperial topaz on an albite matrix from a pocket in the Katlang Pegmatite of Pakistan. These colors are a result of the rock being intrusive instead of extrusive. There are five types of intrusive rocks, which are granite, pegmatite, gabbro, diorite and peridotite. Start studying Intrusive vs Extrusive (ROCKS). 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