Phyllite

Wanna have some fun? Gather some geologists around a sample that might be phyllite or might be schist and watch them go.

Phyllite is a protolith of schist.

Properties
Rock group Metamorphic
Metamorphism type Regional
Metamorphic rock class Pelitic
Marl
Protolith Slate

Phyllite in Hand Sample

Archean-aged phyllite from Ontario

Crossbedding preserved in phyllite

Phyllite ft. pyrite

Phyllite in Thin Section

Chlorite-rich phyllite, plane polars

Chlorite-rich phyllite, crossed polars

Phyllite, plane polars
Phyllite, crossed polars