Shale

Sample of raw shale from Westwood Works, West Lothian

Shale, oil

Shale, oil - dark grey and pale brown banded - from Belford, Northumberland, England.

Shale, rain pitted

Rain pitted shale, from Massachusetts, USA.

Shale, quartz vein, en echelon

Shale, quartz vein, en echelon - fine grained - with en echelon fractures filled with quartz - from the Cow Branch Formation of the Upper Triassic Epoch of Solite Quarry, Eden, North Carolina, USA.