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The Scheme for Igneous Rock Identification
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A Brief Tour
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Grain Size Description Crystal size
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Igneous rocks have “Intergrown Crystals”
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Intergrown
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Intergrown
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Not Intergrown
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Where it was formed Outside the volcano: Extrusive
Inside the Earth: Intrusive Where it was formed
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Bubbles? Yes= Vesicular
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Bubbles? No=Non-vesicular
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Color Neither Light nor Dark Very Light NotVery Light Not Very Dark
Darkest Lightest
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Medium Density Density Light Dense Very Dense
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Finding The Minerals Unless you have other information,
work in the middle of the rock’s box. Identify the rock.
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This is the amount of Potassium Feldspar in the rock.
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This is the amount of Quartz in the rock.
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This is the amount of Plagioclase Feldspar in the rock.
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Name a light-colored, fine-grained
rock with no bubbles. Practice
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Name a coarse-grained, dense rock.
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Name a very light-colored, glassy,
extrusive rock with bubbles.
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