the scheme for igneous rock identification
DESCRIPTION
The Scheme for Igneous Rock Identification. A Brief Tour. Grain Size. Crystal size. Description. Intergrown Crystals. Intergrown. Intergrown. Not Intergrown. Outside the volcano: Extrusive. Where it was formed. Bubbles?. Yes= Vesicular. Bubbles?. No=Non-vesicular. - PowerPoint PPT PresentationTRANSCRIPT
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The Scheme for Igneous Rock Identification
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A Brief Tour
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Crystal sizeDescription
Grain Size
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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 formedOutside the volcano: Extrusive
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Bubbles? Yes= Vesicular
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Bubbles? No=Non-vesicular
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ColorVery Light
LightNotVery LightNot Very Dark
DarkVery Dark
Neither Light nor Dark
Lightest
Darkest
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DensityVery LightLight DenseVery Dense
Medium Density
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Finding The MineralsIdentify the rock.Unless you have other information,
work in the middle of the rock’s box.
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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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Use tick marks on a scrap paper to measure the percentage.Potassium Feldspar 25%Quartz 40%
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Practice
Name a light-colored, fine-grainedrock with no bubbles.
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Name a coarse-grained, dense rock.
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Name a very light-colored, glassy, extrusive rock with bubbles.