Ig. Home | Simp.Class. | Advanc.Class. | Alpha.List | Bowen's Reac.Srs. | ID Keys | Extrus/Intrus | Tect. | Self Tests
MONZONITE   (detail)

  Return to Whole Image

Previous Specimen
                Another specimen

  Return to Classification; pdf version
Typical Minerals
Typical MineralsPLAGIOCLASE - 50-100%
Orthoclase - 10-35%
Mafics - < 10%
Quartz - 0-5%
Detail Description
     The crystals are small enough in this specimen that even with this closeup it is hard to distinguish much. Some pink orthoclase is visible, but the light minerals are a mixture of quartz and plagioclase. It would take a microscope to identify minerals well, but the quartz is less than 20%, taking this rock out of the granite category.
    Return to Whole Image
   Return to Classification; pdf version

LSF Home | Geology Web Sites | Courses | JMU Geology
Last Update: 9/29/00

e-mail: (Fichtels@jmu.edu)