Omaui

As you head down the road to Bluff one of the few side roads on the right will take you to Omaui Bay.
It's the entrance to an estuary. It was quite windy when I was there and patches of partly damp sand had been blasted into the fried egg like patterns as in the first two pics. At the northern end was an out crop of rocks, basalt I think, which has been burnished over many many years by the actions of sand, sea and wind. This has given them the look and feel of metal.