ES2 Metamorphic Rocks - Metamorphic Microstructures #4
Relict sedimentary texture.
This is a gritty low-grade metasediment from the biotite zone of the Scottish Dalradian. The outlines of clastic grains of quartz and twinned feldspar are still clearly visible, although the clayey matrix has recrystallised to fine-grained metamorphic micas.

Crossed polars. Field of view is 2.5 mm across.

Dalradian grit, Sample Ø337

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DJW - August 1997