staurolite zone (Sample
schist from Boyndie Bay. The bulk composition is
marked "y" in the AFM diagram. The texture is
strongly poikiloblastic. The left-hand part of the
photograph consists of a very spongy andalusite
poikiloblast (grey) enveloping biotite, quartz and
opaque. On the right is a twinned staurolite
crystal packed with tiny quartz inclusions.
Field of view
is 3.5 mm across.