"However, clay content is only one piece of the puzzle ... future to estimate the physical properties of fine-grained ...

Sedimentary rocks close sedimentary rockSedimentary rocks ... which originates from clay. Slate is dark grey/green in colour and can be split into thin layers for use as roofing material.

"We have previously studied clay minerals in the composition of volcanic rocks ... and the hydrocarbons migrated from the surrounding sedimentary rocks. Hydrocarbons are able to migrate through cracks ...