• riffsyphon1024 5y

    Dark mafic minerals, maybe some plagioclase, but otherwise I wish I knew more about minerals in thin section.
  • Ron Schott 5y

    This is the Powell kyanite schist from northern Wisconsin, as seen in cross polarized light. Many of the brown/green/tan minerals concentrated left of center are biotite. The poikiloblastic black minerals concentrated right of center are garnet. There are a couple of kyanite grains show first-order yellow colors. Most of the rest of it is quartz or plagioclase (first order grey).
  • riffsyphon1024 5y

    Ron Schott: Ah gneiss, I mean nice schist. ;) I can see the elongation of the kyanite grains but never would have been able to say that was them without the blue color.
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Taken on April 28, 2010
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