Thursday January 31, 2013 (Classification of Igneous Rocks; Begin Lab – Igneous Rocks)

The Launch Pad Thursday, 1/31/13 Provide the following information for the igneous rocks shown in the pictures: place of formation, crystal size (texture), cooling rate. intrusive large slow extrusive small fast extrusive microscopic glassy extremely fast granite andesitepumice

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Assignment Currently Open Summative or Formative? Date IssuedDate Due Date Into GradeSpeed Final Day Quiz 16S11/18 1/242/7 WS – Igneous Rocks F61/282/1 TOMORROW WS – Bowen’s Reaction Series F71/292/1 TOMORROW

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Classification of Igneous Rocks Figure 3.9

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.

Granite Figure 3.11

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.

Basalt

Other igneous rocks groups include: Andesitic (intermediate) Ultramafic

Common Igneous Rocks

Lab Igneous Rocks

Key for Igneous Rocks Lab