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