Southwestern Virginia Case Study

A3 Amphibolite

Elizabeth A. Johnson

Outcrop and Hand Sample Photos and Videos

Click on the image to enlarge.

This is a massive amphibolite.  The field stop seems to have been used as a rock quarry and dump for road construction.  Note the jointing in the rocks (especially in 2nd photo).

 

Thin Section Photos and Videos

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

Interlocking clusters of hornblende (amphibole, green in ppl) and quartz.

 

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

Media Attributions

  • A3-Amphibolite-1
  • OLYMPUS DIGITAL CAMERA
  • A3 amph 4x ppl
  • A3 amph 4x xpl
  • A3 amph ppl
  • A3 amph xpl

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Introduction to Petrology by Elizabeth A. Johnson is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.

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