what are the twelve types of igneous rocks? is andesite or clay one of the twelve?
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"\nAndesite porphyry\nAndesite\nAnorthosite\nBasalt\nBasalt porphyry\nBasalt, vesicular\nDiorite\nDunite\nFelsite\nGabbro\nGranite, Alkali-\nGranite, Plagio-\nGranodiorite\nMonzonite\nMonzonite, quartz\nObsidian\nPeridotite\nPumice\nPyroxenite\nRhyolite\nRhyolite porphyry\nScoria\nSyenite\nVocanic breccia\nVolcanic tuff\n"\n\nApparently Andesite is on the list ;O)
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Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from either the Earth's mantle or pre-existing rocks made molten by extreme temperature and pressure changes. Over 700 types of igneous rocks have been described, most of them formed beneath the surface of the Earth's crust. The word "igneous" is derived from the Latin ignis, meaning "fire".
654586
Igneous rocks-- formed from magma, extrusive or intrusive.  extrusive have small crystal forms ex. basalt, scoria, pumice.  Intrusive large crystals forms ex. granite, gabbro\n\nSedimentary rocks -- the only rocks that contain fossils, formed at the surface, formed from fragments of other things ie. rocks, fossils, woody plants (coal), or minerals crystallizing out of water (limestone) -- Are porous found in aquifers, oil fields.\n\nMetamorphic rocks -- forms from alteration of other rock with increased pressure and/or temperature.  Always in a solid state (they don't melt)called recrystallization, form new minerals that are stable at increased temperature and/or pressure, happens below the earth's surface (at depth).
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ok. i am giving u links which will help u find the right information fast and efficiently. since you have to write in ur words, its better that u deduce the answers urself. it should be quite simple and it will help you.\n\nbasically granite is an igneous rock which is formed due to the cooling down and crystallization of molten magma. here are the links which will help u. there is a file included which is quite informative.\n\nMost of the sites have overlapping information, so use the info u need. Have fun and do cite the links as the sources
782941
http://pubs.usgs.gov/gip/volc/types.html\nThe website above takes you to USGS pub called: \nPrincipal Types of Volcanoes.\n\nIt will help you answer your  question.
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phyllite, basalt, slate, shale. There are many types of schist. It is defined mainly as being a plated metamorphic rock in which the mineral crystals can bee seen with the naked eye.
359180
Chondrites and achondrites is one answer.  Chondrites are the more common form.  But another answer would be "stony" and "iron", of which the stony form is more common.  But of course you can have stony-iron meteorites too...
1526
Shales can be changed into schist by way of moderate heat or shearing pressure accompanying regional (tectonic) deformation\n\nIf you are asking for specific minerals, it can be quartz, micas, amphiboles; often garnets, kyanite, or other aluminosilicates
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quartz. This is not all that magma contains though, It can also have feldspar, garnet, and many other minerals. Quartz is the most common though.
205880
igneous... hmm fudge? sedimentary, sugar cookies? metamorphic chocolate chip. neat question but I think candy is more like igneous, fudge more like sedimentary, and metamorhic... crush up several types and rebake them as granite!
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iron, stony, stony-iron,are the three basic types, though there are many other variations that are recognized such as carbonaceous chondrite
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I assume you mean which type of rock did all rocks start out as???\n\nThat would be igneous. All started out in a molten state. IS that what you mean???\n\n:)
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Ash  | Lava flow | Lava dome | Lava | Vent | Tephra | Caldera | Lahar | Fissure | Dike | Magma
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There are three major ways that rocks are formed. The first of these is from heat ie- igneous rocks. They are the volcanic rocks, among which are obsidian, and granite. Both obsidian and granite contain the same minerals but their different appearances are caused by differences in the speed of their cooling. Obsidian cooled very rapidly and has a glassy texture.  Granite cooled very slowly and the separate minerals crystallized into larger crystal. The three major minerals of granite and obsidian are quartz, feldspar, and mica, each cool at a different rate.\n\n\nGranite is an Intrusive rock=\nIgneous rock that cools and solidifies beneath the Earth’s surface\n\nObsidian is an Extrusive rock=\nIgneous rock that cools and solidifies at or very near earths surface eg- in a lava flow
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Curiously, I could not find a comprehensive listing.  This site might be helpful, however, or at least give you a start.\n\nhttp://dir.yahoo.com/Science/Earth_Sciences/Geology_and_Geophysics/Volcanology/Volcanoes
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igneous extrusive basalt
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Quartz,Silicates, See Bowens reaction series at http://earthsci.org/education/teacher/basicgeol/igneous/igneous.html#BowensReactionSeries