Kingy said:

Yesterday morning was a trip to Bunbury to collect some crushed lava from the old volcano. This is the very old lava flow that cooled and did the hexagon shape as India decided to depart Northwards.
It covers most of the Southwest of WA, but has had multiple changes of sea level since. These days there is only about 2 or 3 meters of sand covering it, and there are several places where it is a feature.

Looking at you Bunbury.

Pleasing colour. What do you use it for?