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Geosciences LibreTexts

5.9: A3 Schist

  • Page ID
    11142
  • Outcrop and Hand Sample Photos and Videos

    Click on the image to enlarge.

    These outcrops are only a couple hundred meters down the road from the A3 amphibolite. The schist shows distinctive foliation in outcrop.

    The hand sample shows the complex foliation in more detail. Pause the video when I show the side of the rock cut by a rock saw.

    Thumbnail for the embedded element "A3 schist hand sample"

    A YouTube element has been excluded from this version of the text. You can view it online here: pb.libretexts.org/petrology/?p=317

    Thin Section Photos and Videos

    Click on the image to make it larger. 1st = plane polarized light; 2nd = cross-polarized light.

    Hornblende (green-brown in ppl, yellow-orange-blue in xpl), garnet, qtz, plagioclase.

    Entire thin section scan. 1st = ppl; 2nd = xpl. Click on the image to make it larger.

    This thin section is super interesting! Especially for thinking about deformation events. It was made from the cut side of the hand sample shown in the YouTube video above.