Figure F25. Metamorphic rock fragments. A, B. Feldspar-rich, foliated. C, D. Quartz-carbonate-mica aggregate, nonfoliated. Lack of foliation would also be consistent with the alternative interpretation of carbonate-altered plutonic rock fragments. E, F. Low-grade metamorphic rock fragment (slate) or, alternatively, a fissile silty mudstone. Left = plane-polarized light, right = cross-polarized light.
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