Slate is the protolith of phyllite.

Rock group	Metamorphic
Metamorphism type	Regional
Metamorphic rock class	Pelitic Marl
Protolith	Shale

Slate in Hand Sample

Two samples of Chancellor Formation slate
Red slate with reduction spots
Limy slate

Slate in Thin Section

Slate, plane polars
Slate, crossed polars
Slate bearing andalusite, plane polars
Slate bearing andalusite, crossed polars

Slate, Plane Polars

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Slate, Crossed Polars

Slate in plane polarized light. Magnification: 40x Click here to watch slate rotate in plane polars: https://youtu.be/JEYuAwX–P8 Click here to explore this …