It is well cemented by microcrystalline quartz, and was the hardest of all samples to hammer in the field.
These are infilled by aggregates of fibrous quartz and actinolite that are aligned parallel to the macroscopic mineral lineation.
Quartz-feldspar ribbons and aggregates define a mineral stretching lineation.
The quartz aggregates show a crystallographic preferred orientation.
The quartz ribbons display strong undulose extinction and locally well-developed core-and-mantle microstructures.
The features result from initial growth of the quartz grain, partial resorption (dissolution) during a period of disequilibrium, then further growth to form the mantle.
The presence of quartz-filled microcracks in feldspar crystals suggests that deformation continued during cooling and crystallization.
The newly crystallized quartz grains are characterized by elongate crystals oriented oblique to the shear band margins, defining a typical grain-shape foliation.
