ES2 Metamorphic Rocks - Metamorphic Microstructures #23
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Helicitic porphyroblast (post-kinematic).
The centre of the field of view is occupied by a poikiloblast of
relatively high relief chloritoid, the straight crystal face on its
upper right edge being fairly obvious. The strongly-crenulated
foliation in the rock passes without a break right through the
poikiloblast, being defined within it by trails of graphite, quartz
and other inclusions. Clearly, chloritoid growth entirely post-dates
all deformation in the rock.
Plane-polarised light. Field of view is 2.5 mm across.
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