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Topic: Igneous Rocks Topic: Igneous Rocks
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Igneous RocksIgneous Rocks
-- Lava – Lava – Magma – Magma –
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CoolingCooling
SolidificationSolidification – – CrystallizationCrystallization – –
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Igneous ClassificationIgneous Classification
Mineral composition -Mineral composition - Texture -Texture -
– --
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ExtrusiveExtrusive Igneous Rocks Igneous Rocks
-- -- --
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IntrusiveIntrusive Igneous Rocks Igneous Rocks
- - --
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Animation: Igneous Rock Animation: Igneous Rock Environments of FormationEnvironments of Formation
http://www.classzone.com/books/earth_science/terc/content/investigations/es0603/es0603page05.cfm?chapter_no=investigation
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Best Friend Pg 6Best Friend Pg 6
Scheme for Igneous Rocks for Scheme for Igneous Rocks for identificationidentification
Take out YOUR ESRT!Take out YOUR ESRT!
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Identifying Igneous RocksIdentifying Igneous RocksIgneous Rock Names
Environment of Formation
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Crystal Crystal sizesize
DescriptionGrain Size
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Bubbles?Bubbles? Yes= Vesicular
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Bubbles?Bubbles? No=Non-vesicular
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ColorColorVery Light
LightNotVery LightNot Very Dark
DarkVery Dark
Neither Light nor Dark
Ligh
test
Darke
st
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DensityDensityVery Low
Low DenseVery Dense
Medium Density
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CompositionComposition
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CompositionComposition
Felsic Rocks – Felsic Rocks – – --– --– --
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MaficMafic– --– --– --
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Finding The MineralsFinding 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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PracticePracticeName a light-colored, fine-grainedrock with no bubbles.
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Name a coarse-grained, dense rock & contains only Olivine.
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Name a very light-colored, glassy, extrusive rock with bubbles.
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FQ:FQ:Name the fine grain, vesicular Name the fine grain, vesicular igneous rock, with the minerals igneous rock, with the minerals
plagioclase feldspar, pyroxene and plagioclase feldspar, pyroxene and amphiboles.amphiboles.