Slate is the protolith of phyllite.

Rock group Metamorphic
Metamorphism type Regional
Metamorphic rock class Pelitic
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, PPL

Slate, Plane Polars

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Slate, XPL

Slate, Crossed Polars

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