<a href="https://en.wikipedia.org/wiki/Andalusite" class="extiw" title="w:Andalusite">Andalusite</a>-<a href="https://en.wikipedia.org/wiki/Cordierite" class="extiw" title="w:Cordierite">Cordierite</a> <a href="https://en.wikipedia.org/wiki/schist" class="extiw" title="w:schist">schist</a> in <a href="https://en.wikipedia.org/wiki/metasedimentary" class="extiw" title="w:metasedimentary">metasedimentary</a> sequence. Western part of <a href="https://en.wikipedia.org/wiki/Fossil_Ridge" class="extiw" title="w:Fossil Ridge">Fossil Ridge</a>. Large brown crystals are andalusite.
Ed DeWitt
<a rel="nofollow" class="external text" href="https://pubs.usgs.gov/imap/i-2738/">U.S. Geological Survey Geologic Investigations Series I-2738</a>