Gabbro(texture) Phaneritic. This chemistry gives it a tan, pink, or … Obsidian (type of crust/plate tectonic setting) continental, convergent. Most extrusive (volcanic) rocks have small crystals. Igneous rock formation. vesicular basalt (plate tectonics/crust type) Extrusive- lava plateau ... Intrusive- batholith. Komatiite is a very rare and old extrusive igneous rock. Ash Tuff. Before plotting the composition … Before discussing further differences between both rocks, let us see what is a rock and what are intrusive rocks and extrusive … Its principal minerals are feldspars, quartz, and mica. Occurrence of igneous rocks can be either intrusive (plutonic) or extrusive … Granite, the equivalent of its extrusive (volcanic) rock type rhyolite, is a very common type of intrusive igneous rock. Extrusive. Andesite are fine-grained extrusive igneous rocks while diorite are coarse-grained intrusive igneous rocks. 5 Terms. QAPF Diagram for Dacite: A QAPF diagram is a method of classifying igneous rocks on the relative abundance of quartz, alkali feldspar, plagioclase feldspar, and feldspathoid minerals. Examples include basalt, rhyolite, andesite, and obsidian. This means that they cool relatively quickly and under low pressures. An extrusive igneous rocks definition states these rocks form when magma "exits and cools above (or very near) the Earth's surface." This results in rocks with a very fine-grained or even glassy texture. Rhyolite is the most silicious of the extrusive rocks, containing at least 65 percent silica (mostly in feldspar minerals and quartz) and few ferromagnesian minerals. Andesite. lava plateau. Scoria (texture) vesicular. Andesite is a lighter greenish‐gray and has more silica and plagioclase feldspar and less ferromagnesian minerals than basalt. Intrusive and extrusive features. SUMMARY: Intrusive: Gabbro Diorite Granite Extrusive: Basalt Andesite Rhyolite . Types of extrusive igneous rocks include: pumice, obsidian, andesite, rhyolite, and basalt. Andesite (named after the Andes Mountains in South America) is a cousin to basalt in that it's also volcanic in nature, however is lighter-coloured due to the decreased concentration of darker minerals. Igneous rocks — those which originate from magma — fall into two categories: extrusive and intrusive. 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. Therefore, they are typically fine … What are Igneous Rocks – Intrusive and Extrusive Igneous rocks are rocks that are created beneath the earth in the earths mantle or above on the earth’s surface. Extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools quickly. Hot gasses are often trapped in the quenched lava, forming bubbles (vesicles). HYDROTHERMAL SOLUTIONS - "volatilize gases" that escape from magma (water, CO 2, Methane) plus … Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals … Extrusive- fissure... Intrusive- pluton. Volcanic processes has shaped the extrusive igneous rock formations at these … Romy_roc. Geological setting. The first letter of each of these minerals / mineral groups is the source of the "QAPF" name used for the diagram. Process. Statement. Examples of extrusive igneous rocks include basalt, andesite, rhyolite, dacite, obsidian, pumice and scoria. Example. It contains more than 68% weight % of silica in composition and is granular and coarse-grained in texture. They have different sized crystals of their chemical and mineralogical composition. An igneous rock is either an intrusive or extrusive rock and can have one or a multiple variety of minerals within it. 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