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Monday February 13, 2012

Monday February 13, 2012. (Common Igneous Rocks). The Launch Pad Monday, 2/13/12. Describe these six types of igneous rocks. Note the variations in texture and color. Announcements. I will be available after school today until 4:45 . Latest News.

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Monday February 13, 2012

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  1. MondayFebruary 13, 2012 (Common Igneous Rocks)

  2. The Launch Pad Monday, 2/13/12 • Describe these six types of igneous rocks. • Note the variations in texture and color.

  3. Announcements • I will be available after school today until 4:45.

  4. Latest News New Comet Discovered by Amateur Astronomer Click here for article: http://www.universetoday.com/93539/new-comet-discovered-by-amateur-astronomer/

  5. 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.

  6. Granite Figure 3.11

  7. 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.

  8. Basalt

  9. Other Igneous Rocks Other igneous rocks groups include: Andesitic (intermediate) Ultramafic

  10. Common Igneous Rocks

  11. Evolution of Magma

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