MondayFebruary 13, 2012

(Common Igneous Rocks)

The Launch PadMonday, 2/13/12

Describe these six types of igneous rocks.

Note the variations in texture and color.

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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.

Granite

Figure 3.11

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.

Basalt

Other Igneous Rocks Other igneous rocks groups include:

Andesitic (intermediate)

Ultramafic

Common Igneous Rocks

Evolution of Magma