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