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Definition
| Molten rock that has not reached earths surface |
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| igneous rocks formed by subsurface cooling of magma. Coarse grain because slow rates of cooling |
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| igneous rocks formed from molten rock. Fast cooling fined grain |
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| process of rock melting in which minerals with low melting points melt before minerals with higher melting points as a rock mass is heated and/or subjected to a decrease in pressure |
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| concentration of crystals of particular mineral in portions of magma as it cools |
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| first crystals to form in a cooling magma settle to the bottom of magma chamber |
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| "mush" of precipitated crystals is separated from the magma by earths movements |
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| textural term; individual mineral crystals can be seen from unaided eye |
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| textural term; individual mineral crystals to small to see |
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| textural term; rapid cooling of lava gives glassy appearance |
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| large crystals enclosed by finer-grained matrix. Interrupted cooling history |
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Definition
| large crystals enclosed by finer-grained matrix. Interrupted cooling history |
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Definition
| large crystals enclosed by finer-grained matrix. Interrupted cooling history |
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| rock material ejected during volcanic eruption |
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| rock or minerals high in magnesium and iron and the magmas from which they form |
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| igneous rocks with high percentage of light colored minerals(quartz, feldspar, feldspathoids, muscorite) |
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Definition
| igneous rocks composed mostly of mafic minerals or magma from which they are formed |
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Definition
| ultramafic igneous rock, mostly olivine |
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Definition
| Dark colored, amorphous material, forms by superfast cooling |
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| Volcanic glass of various colors found in chilled margins of intrusive igneous bodies formed from basaltic magma |
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| coarse grain igneous rock, major component of continental crust |
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| less potassium feldspar than granite |
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| fined grain igneous rock; extrusive; found in andes mountains; 25-40% amphibole, pyroxime and biotite |
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| dark colored, fined grained, extrusive igneous rock; calcic plagioclase and pyroxenes |
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| coarse grain, ultramafic, plutonic, igenouse rock, composed mostly of olivine. Major component of upper mantle |
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| suite of rare igneous rocks noted by presence of ultramafic lavas |
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| descriptive term; body is bigger than other part |
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| intrusive igneous body that cuts across bedding, foliation or structure of county rock into which rock intrudes |
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| tabular, discordant, intrusive, igneous body |
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| igneous intrusion whose surfaces are parallel to layering of the intruded rock |
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| tabular, concordant, intrusive igneous body |
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Definition
| largest dimension is less than 10 times smallest dimension |
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