Slate

Low-grade metamorphic rock

Fine rock transformed by pressure into strong, flat sheets.

Canada

Sample content • provenance shown broadly for demonstration

At a glance

Fast Facts

metamorphic

clay minerals + quartz

Low heat and directed pressure acting on shale

Canada

Read the evidence

The Story

Slate starts as shale or mudstone. During mountain building, heat and pressure realign tiny clay minerals. The new fabric allows the rock to split into smooth, thin sheets.

Make the connection

Where Does It Fit?

Starting material→Low heat and directed pressure acting on shale→Slate