Feldspar porphyroclasts have been rotated during shearing and folding.
The matrix is composed of finegrained recrystallized feldspar.
The two planes intersect along cd which is the locus of liquids in equilibrium with a silica polymorph + two feldspars + aqueous fluid.
The magnetic fraction of the surface sand contains pyroxene and feldspar grains as in the bulk material, but little quartz.
Some feldspar grains, however, show weakly developed asymmetric strain shadows (-type).
It is a medium-grained, foliated orthogneiss with small feldspar 'augen'.
Such spidergrams strongly suggest that these metafelsites solidified from highly fractionated melts, which underwent extensive, low pressure, accessory phases- and feldspar-dominated crystal fractionation.
The presence of quartz-filled microcracks in feldspar crystals suggests that deformation continued during cooling and crystallization.
