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Ig. Home | Simp.Class. | Advanc.Class. | Alpha.List | Bowen's Reac.Srs. | ID Keys | Extrus/Intrus | Tect. | Self Tests
ALKALI GRANITE (detail) Return To Whole Image
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Typical Minerals QUARTZ > 20% ORTHOCLASE is greater than Plagioclase Mafics - < 10%
Detail Description In this detail the pinkish colored orthoclase stands out clearly, but quartz is also common (clear, glassy, no cleavage; for example the grain on the bottom, just left of center.) Mafic (black)minerals are rare (<10%) in granites. The mafic mineral is most likely biotite with a few grains of amphibole too.
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LSF Home | Geology Web Sites | Courses | JMU Geology Last Update: 9/29/00 e-mail: ([email protected])
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