This website does readability filtering of other pages. All styles, scripts, forms and ads are stripped. If you want your website excluded or have other feedback, use this form.

Untitled

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

  Return to Whole Image
     

Return to First Specimen

  Return to Classification; pdf version Typical Minerals Ca PLAGIOCLASE & MAFICS (pyroxene) about 50/50

Amphibole often present
Olivine - absent to trace Detail Description      This is the same rock as last detail but this one has been cut on a rock saw and the slab wetted down with water to take the picture. Slabbing a rock often brings out details and appearances not visible otherwise. In this case the rock does not look that much different from the previous detailed picture, except that it looks overall darker because it is wet. Still, we can easily see the black. elongate pyroxene crystals and the dark gray calcium-rich plagioclase crystals in the spaces in between. The white plagioclase is not as evident in this picture.
     An overall dark colored rock just like we expect from a color/texture classification.     Return to Whole Image
   Return to Classification; pdf version

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

e-mail: ([email protected])