Gravel doesn't have a single, specific particle shape. It's a mixture of angular and rounded fragments, with various sizes ranging from 2 mm to 75 mm.

Here's a breakdown:

* Angular gravel: These particles have sharp edges and irregular shapes, often formed from freshly broken rock.

* Rounded gravel: These particles have smoother surfaces and more rounded shapes, often formed by erosion and weathering over time.

The specific shape of gravel depends on its origin and the geological processes it has undergone.

For example, gravel from a quarry might have more angular particles, while gravel from a riverbed would have more rounded particles.