5. Is Obsidian mafic felsic or intermediate? rhyolite felsic or mafic. Rhyolite, andesite, and basalt form a series that varies in composition, from felsic to mafic because of an increasing fraction of iron+magnesium rich minerals that darkens the tone. Imagine standing at the base of the Kilauea Volcano. Pegmatites are little different from the common igneous rocks in major elements of bulk composition, and they range from felsic to mafic (silica-rich to silica-poor); granitic and syenitic types are most abundant. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.Felsic magma or lava is higher in viscosity than mafic magma/lava.Felsic rocks are usually light in color and have specific gravities less than 3. The rhyolite cooled rapidly, and the granite cooled slowly. Felsic Magma (Rhyolitic). Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian’s composition is extremely felsic. Felsic lava. Gummy Bear Drink Starbucks, Types of Lava. 20.3c).Its contacts are mylonites, separating it from the Central Tectonic Domain to the east and from boninitic amphibolites to the west (Fig. 6.Mafic rocks are darker in color than felsic rocks. Before cooling, felsic magmas have a very high viscosity. Felsic magma, such as rhyolite, is usually erupted at low temperature and is up to 10,000 times as viscous as basalt. andesite. The basalt cooled rapidly, and the gabbro cooled slowly. Crystallization may sometimes have begun while the magma was deeply buried; in such cases, the rock may consist principally of well-developed, large, single crystals ( phenocrysts ) at the time of extrusion. Pages 4. Join Yahoo Answers and get 100 points today. Is  the Arabian Peninsula considered a part of the Sahara desert or not? In terms of chemistry, this means that mafic and felsic minerals and rocks are at opposite ends of the elemental spectrum. Felsic rocks are usually light in color and have specific gravities less than 3. felsic rock, highest content of silicon, with predominance of quartz, alkali feldspar and/or feldspathoids: the felsic minerals; these rocks (e.G., granite, rhyolite) are usually light coloured, and feature low density. rhyolite. It is a glassy-textured, extrusive igneous rock. These low temperature lava flows have a high viscosity, which clogs the inner workings of volcanoes trapping and compounding gases. There in the hardened lava is basalt, one of the world's most common igneous rocks. Well, as you can see, mankind is very good when a need arises to make simple concepts difficult to understand. gabbro. Why or why not? Obsidian is an easily recognizable igneous rock. Obsidian consists mainly of SiO2 (silicon dioxide), usually 70% or more. ANDESITIC ROCKS or Intermediate Rocks ANDESITE is a medium gray, fine-grained rock of volcanic origin, named after the Andes Mountains, but is abundant in all volcanic regions associated with subduction zones (where crust is sinking and partially remelting - example: volcanos associated with … Rhyolite, extrusive igneous rock that is the volcanic equivalent of granite. PART 1: Fill in the following table from the 6 common rocks we talked about in class: Basalt. The crust is most felsic, which is why's it's floating on the mantle. Makita Dux60z Uk, intermediate. Was The Meteorite that killed all of The Dinosaurs worse than the current pandemic? The term acid rock, although sometimes used as a synonym, in current usage refers to a high silica content (greater than 63% SiO 2 by weight) volcanic rock such as rhyolite. ultramafic. Most batholiths are emplaced by the process of granitization. * Felsic Classification of Igneous Rocks Intermediate Mafic Obsidian Basaltic glass Extrusive Ultramafic Texture Glassy (non-crystalline) Fine-grained Rhyolite Andesite Basalt Granite Diorite Gabbro Perl. granite. Igneous Rocks Chemical composition Felsic Granite Rhyolite Intermediate Diorite. Black Bear Face Drawing. plutonic. Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic.Obsidian consists mainly of SiO 2 (silicon dioxide), usually 70% or more. Dikes are concordant and sills are discordant. This preview shows page 2 - 4 out of 4 pages. The mineral compositions of igneous rocks are usually described as being felsic, intermediate, mafic, or ultramafic (as examples, see Figure 4.7 and Figure 4.8). Felsic rocks are dominated by silicaceous minerals. 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