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Contents of 4.2 How are igneous rocks classified?

4.2 How are igneous rocks classified?

• Naming igneous rocks - granitic (felsic) rocks
• Granite
• Phaneritic
• Over 25 percent quartz, about 65 percent or more feldspar
• May exhibit a porphyritic texture
• Very abundant as it is often associated with mountain building
• The term granite covers a wide range of mineral compositions