Is Granite intrusive or extrusive?
452704
intrusive igneous rock meaning formed when molten magma is inside the earth and cools there as opposed to extrusive which flow to the surface and cools there
38589
The term comes from the Latin word "Ignis" which means fire. Igneous rocks are produced by melting within the earth and later cooling of the molten magma.\n\nThere are two major subdivisions of igneous rocks:\nExtrusive\nIntrusive\n\nExtrusive igneous rocks come from volcanic activity. They are "extruded' by being ejected from a volcano or being part of a slow moving lava flow on the surface of the earth.  Examples: basalt flows, pumice, obsidian, ash, scoria\n\nIntrusive igneous rocks are formed by these molten rocks as they cool within the earth. The slow cooling allows the rock to separate into different minerals and form grains. Large masses of intrusive rocks that harden within the earth are called batholiths and plutons, depending on the size.  Examples of intrusive igneous rocks are granite, gabbro, and monzonite. \n\nHere is a list with photos of examples:\nhttp://csmres.jmu.edu/geollab/Fichter/IgnRx/IgAlphabetical.html
749688
1. yes they occur in the cracks of rocks but not just metals .. for example quartz is not a metal but it can form veins .. Veins are mineral deposits which form when a fracture or fissure within a larger body of rock is filled with new crystalline material. Veins are believed to form when aqueous solutions migrate through fissures in rock and deposit minerals onto the fissure walls. \n\n2. Ilmenite is a crystalline iron titanium oxide (FeTiO3).\nwhile rutile is a mineral composed dominantly of titanium dioxide, TiO2 so its not an iron ore !!
983191
Depends what medium is eroding it.\nI think you're looking for the hardness scale.
416899
this question belongs in the earth sciences category.  this is not a question about astronomy.\n\nhttp://en.wikipedia.org/wiki/Astronomy\n\nyes, the answer is hardness.
621837
neither granite nor obisdian are minerals they are two different types of igneous rocks. basically molten granite cools slow generating large crystals, obsidian cools very fast giving it a glassy look and making it nearly impossible to pick out individual crystals
340074
granite is very abundant in continental crusts. There are lots of plutonic rocks in continetal regions not like in oceanic crusts.
323011
depend on the type of rock. what material or materials is it made of, is it granite or what?
213437
That is like asking someone to list all of the existing and past mountain ranges on the Earth. However, not all mountain ranges have exposures of granite. In any case, the list would be quite long. \n\nGranite is found in many parts of the continental crust. Granite is associated with volcanic areas, continental shields (old parts of the continents), and orogenic belts. It forms batholiths (very large area), plutons (smaller in size) and sills and dikes. Granites only form beneath the surface as intrusive rock, and are later exposed by erosion and uplift.  \n\nGranite is found in the Canadian Shield, the Rocky Mountains, the Sierra's, the Appalachians, the Andes, the Arbuckle Mountains in Oklahoma, the Alps, the Pyrenees, West Antarctica, eastern Egypt, the Queensland Granite Belt in Australia, the Urals of Russia, the Zagros Mountains of Iraq,  ...and many many more places....\n\nHere is a good reference on the origins of granite:\nhttp://www.geologynet.com/granite1.htm\n\nThe answer about "granite is a basaltic rock" is wrong. Basalt is an extrusive mafic rock, and granite is an intrusive felsic rock, with a different mineral composition than basalt.
493068
It's possible that the veins are later intrusions--molten rock forcing their way into the cracks. Both the rock and the veins have an igneous look about them.
502206
Contact - magma is injected into preexisting rock & the heat from the magma metamorphoses the rock.\n\nRegional - covers a large area; usually due to mountain forming episodes called orogenies; the mountain forming episodes are caused by two continental plates converging; neither plate subducts b/c they are both the same in density.\n\nCataclastic - occurs along faults where plates grind past each other; due to friction\n\nThere is also burial metamorphism which occurs due to great heat & pressure from burial under many layers of sediment; when heat & pressure becomes great enough, burial metamorphism becomes regional.
1066723
I'm quite sure it's A, extrusive rocks are exposed and cool very quickly.  Since they cool rapidly, crystals have no time to grow, and most crystals are smaller than a millimeter.  Obsidian, in fact, has no crystals at all and is a type of glass.  Intrusive rocks (such as granite) on the other hand, cool slowly (as they are insulated by the earth) and larger crystals form.  \n\nFor further information,\nhttp://www.geology.ufl.edu/Class_Notes/GLY2010_Fall_1996/summaries/intrus1.html\nhttp://www.nps.gov/brca/Geodetect/Rocks%20&%20Minerals/igneous.htm\n\nHope this is helpful.
703711
Well, I can only partly answer your questions.\nPorosity is a measure of whether a rock has empty spaces in it. That's important because the rock could hold water or oil, for example.\nPermeability is a measure of whether fluids can move around in a rock--are the pore spaces connected to each other or not? That's important because water or oil can't really move through rocks that are not permeable. \n\nSandstone, which is a rock made of small particles, can be very porous and very permeable--depending on how well the grains have been cemented together, and also whether it has fractures, etc. \nNow..to the tricky part of your question: about rose quartz. Quartz is a mineral. A single crystal of quartz will have essentially zero porosity or permeability(unless its full of cracks). You could make a nice water bowl out of rose quartz because it wouldn't leak or soak up the water. But sandstone could be made entirely of rose quartz grains cemented together....So....the rose quartz sandstone could be porous and could be permeable...or not, depending on how well it was cemented.\nCalcite...is a mineral. same story. A pure crystal would have essentially no porosity or permeability. But, calcite grains could make up a sandstone (see above). Also, limestone is made of calcite (or aragonite), and it can be both highly porous and permeable--that's why there are so many caves in limestone.\n\nYou don't ask a question about grain sorting, so I don't know how to respond. I'm guessing you want to know how it relates to porosity and permeabilty. Imagine dumping a bunch of marbles of the same size into a barrel. They would be perfectly sorted (same size and shape), and you could calculate how much water you could pore into the barrel to fill up the spaces between the marbles. Now imagine filling up the same barrel with items of all different shapes and sizes (poorly sorted). You could imagine that it could hole more water than the marble-filled barrel, UNLESS, PERHAPSyou happened to pore in lots of sand or other fine particles in with your big items. \nSandstone can be well-sorted (think of nearly pure quartz sand in sand dunes), or poorly sorted (think of sand in a river bottom).\nBecause rose quartz and calcite are minerals,  they could be components of well sorted or poorly sorted sands. BUT, calcite is softer than quartz, so...it would be much less common in well-sorted sands--which tend to be, but not always, quartz- rich. Beach sand, for instance, can be moderately well-sorted and composed mainly of quartz sand but with  tiny calcite shell fragments.
442695
http://www.pubs.asce.org/WWWdisplay.cgi?9605225\nSaprolite is a rare find in our area.  We've found it in a few parking lots, and we can buy it from only a few dealers.\n\nSaprolite is also called "rotten granite" -- it really is granite that's been partially changed by thousands or millions of years of weathering. \n\nhttp://saltthesandbox.org/rocks/saprolite.htm\n\nProperties\n1.Saprolite forms when granite and other igneous and \nmetamorphic rocks are exposed to humid climates for \nthousands or millions of years. \n2.Saprolite is mostly reddish in color.\n3.Its crystals are usually pea-sized or smaller\n4.it started out as granite\n5.Is made mostly of the minerals feldspar and quartz, and may also contain small crystals of mica or darker minerals.
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).
714880
Short, succinct and correct answer: \nHEAT and PRESSURE cause granite to become gneiss and change sandstone into quartzite.\n\nMore fleshed out, fuller (and still correct) answer:\nMetamorphic rocks form from heat and pressure which changes the original or parent rock into a completely new rock. The parent rock can be either sedimentary, igneous, or even another metamorphic rock. The word "metamorphic" comes from Greek and means "To Change Form".\n\nSolid rock can be changed into a new rock by stresses that cause an increase in heat and pressure. There are 3 main agents that cause metamorphism. Factors that cause an increase in Temperature, Pressure, and Chemical changes are the three agents that we are going to study. \n\nTemperature increases can be caused by layers of sediments being buried deeper and deeper under the surface of the Earth. As we descend into the earth the temperature increases about 25 degrees Celsius for every kilometer that we descend. The deeper the layers are buried the hotter the temperatures become. The great weight of these layers also causes an increase in pressure, which in turn, causes an increase in temperature. \n\nThe descending of rock layers at subduction zones causes metamorphism in two ways; the shearing effect of the plates sliding past each other causes the rocks coming in contact with the descending rocks to change. Some of the descending rock will melt because of this friction. When rock melts it is then considered igneous not metamorphic, but the rock next to the melted rock can be changed by the heat and become a metamorphic rock.\n\nMetamorphic rocks are almost always harder than sedimentary rocks. They are generally as hard and sometimes harder than igneous rocks. They form the roots of many mountain chains and are exposed to the surface after the softer outer layers of rocks are eroded away. Many metamorphic rocks are found in mountainous regions today and are a good indicator that ancient mountains were present in areas that are now low hill or even flat plains.\n\nGneiss is a high grade metamorphic rock. This means that gneiss has been subjected to more heat and pressure than many other metamorphic rocks. The minerals that compose gneiss are the same as granite. Feldspar is the most important mineral that makes up gneiss along with mica and quartz. Gneiss can be formed from a sedimentary rock such as sandstone or shale, or it can be formed from the metamorphism of the igneous rock granite. Gneiss can be used as paving and building stone.\n\nQuartzite is much harder than the parent rock sandstone. It forms from sandstone that has come into contact with deeply buried magmas. Quartzite looks very similar to its parent rock. The best way to tell quartzite from sandstone is to break the rocks. Sandstone will shatter into many individual grains of sand while quartzite will break across the grains.
554062
you need to see whethre the "grains " ae INTERLOCKING, or fixed togethre with a cement. Interlocking grains, whee there are no spaces between them (the "grains" wi be crstals of quartz, felspar and ther minerals depending on type of rock) are indicative of an igneous rock. (or metamorphic) rock. sdimentar rocks are generally made of "clasts" or grains cemented together with a matrix or cement. here are some exceptions to this like evaporites, eg rock salt.