An extrusive igneous rocks definition states these rocks form when magma "exits and cools above (or very near) the Earth's surface." SUMMARY: Intrusive: Gabbro Diorite Granite Extrusive: Basalt Andesite Rhyolite . ANDESITE - aphanitic rock (small crystals) of both mafic and felsic minerals. Intrusive and extrusive features. Its principal minerals are feldspars, quartz, and mica. Hot gasses are often trapped in the quenched lava, forming bubbles (vesicles). Extrusive- Antrim Derry plateau ... Intrusive- Leinster batholith ... 6th Science Extrusive vs Intrusive. Occurrence of igneous rocks can be either intrusive (plutonic) or extrusive … 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. Andesite are fine-grained extrusive igneous rocks while diorite are coarse-grained intrusive igneous rocks. Komatiite is a very rare and old extrusive igneous rock. Before discussing further differences between both rocks, let us see what is a rock and what are intrusive rocks and extrusive … Pumice (intrusive or extrusive) extrusive. This results in rocks with a very fine-grained or even glassy texture. Most extrusive (volcanic) rocks have small crystals. Obsidian (color/mineral name) dark, felsic. Ash Tuff. Types of extrusive igneous rocks include: pumice, obsidian, andesite, rhyolite, and basalt. Examples of extrusive igneous rocks include basalt, andesite, rhyolite, dacite, obsidian, pumice and scoria. Geological setting. 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. This means that they cool relatively quickly and under low pressures. Extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools quickly. vesicular basalt (plate tectonics/crust type) Gabbro(texture) Phaneritic. 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. 5 Terms. Obsidian (type of crust/plate tectonic setting) continental, convergent. Andesite. Scoria (texture) vesicular. 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. It contains more than 68% weight % of silica in composition and is granular and coarse-grained in texture. Extrusive- fissure... Intrusive- pluton. Therefore, they are typically fine … Volcanic processes has shaped the extrusive igneous rock formations at these … Andesite (intrusive or extrusive) extrusive. Extrusive. Process. Before plotting the composition … An igneous rock is either an intrusive or extrusive rock and can have one or a multiple variety of minerals within it. Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals … Extrusive rocks erupt from volcanoes or seafloor fissures, or they freeze at shallow depths. Example. Statement. SUBSURFACE (INTRUSIVE) IGNEOUS FEATURES. They have different sized crystals of their chemical and mineralogical composition. This chemistry gives it a tan, pink, or … Granite, the equivalent of its extrusive (volcanic) rock type rhyolite, is a very common type of intrusive igneous rock. Igneous rocks — those which originate from magma — fall into two categories: extrusive and intrusive. Examples include basalt, rhyolite, andesite, and obsidian. The first letter of each of these minerals / mineral groups is the source of the "QAPF" name used for the diagram. Andesite is a lighter greenish‐gray and has more silica and plagioclase feldspar and less ferromagnesian minerals than basalt. Extrusive. 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. lava plateau. Igneous rock formation. HYDROTHERMAL SOLUTIONS - "volatilize gases" that escape from magma (water, CO 2, Methane) plus … Romy_roc. Extrusive- lava plateau ... Intrusive- batholith. Groups is the source of the `` QAPF '' name used for the diagram common of... Of each of these minerals / mineral groups is the source of the `` QAPF '' name used for diagram. These minerals / mineral groups is the source of the `` QAPF '' name for... Lighter greenish‐gray and has more silica and plagioclase feldspar and less ferromagnesian than., andesite, and mica this means that they cool relatively quickly under! 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