andalusite zone (Sample
Contains a large oval cordierite poikiloblast in
the centre of the field of view, set in a
fine-grained matrix of muscovite, biotite and
quartz. Irregular andalusite poikiloblasts occur in
micaceous selvages elsewhere in the rock. The bulk
composition is marked "x" in the AFM diagram.
Field of view
is 7 mm across.