Monday February 13, 2012
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MondayFebruary 13, 2012
(Common Igneous Rocks)
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The Launch PadMonday, 2/13/12
Describe these six types of igneous rocks.
Note the variations in texture and color.
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Assignment Currently Open
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Quiz 18 S5 2/3 2/3 2/3 2/17
WS – Igneous Rocks (Part 1) F 2/9 2/13
Quiz 19 S6 2/10 2/10
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Latest News
http://www.universetoday.com/93539/new-comet-discovered-by-amateur-astronomer/
New Comet Discovered by Amateur Astronomer
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Granitic Igneous Rocks Granitic igneous rocks are composed almost entirely
of light-colored silicates, quartz and feldspar. They are also referred to as felsic rocks, feldspar and
silica (quartz.)Granitic rocks have a high silica content, about 70%.
Obviously, the most common rock granitic rock is granite.
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Granite
Figure 3.11
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Basaltic Igneous Rocks Basaltic igneous rocks contain substantial
amounts of dark silicate minerals and calcium-rich plagioclase feldspar.
Basaltic igneous rock are also referred to as mafic; they contain magnesium and iron. The most common basaltic rock is basalt.
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Basalt
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Other Igneous Rocks Other igneous rocks groups include:
Andesitic (intermediate)
Ultramafic
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Common Igneous Rocks
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Evolution of Magma