Photograph by David Dorman.
This agate is so far, a unique specimen. Alternating bands of chalcedony and quartz create filligree banding with intricate whorls and fortifications. There are clear botryoidal formations visible at the base from the outside of the stone. So, is it a coloured, whorled agate from the east coast of Scotland, a type that has so far only been found at Dunure in Ayrshire (in colour) and in the vicinity of Carsaig Arches on the Isle of Mull in the Inner Hebrides? I leave it up to you, the viewer to decide if the markings are suitably pronounced for it to be considered of that particular species. It is a beautiful piece regardless. The next photo is of the agates' duplicate half.
It was found by myself in the high summer of 2015, while the tide was on the ebb, along a shingle bank that occasionally produces specimens of stalactitic, sagenitic and moss agates, as well as the more common onyx and fortification stones.
