The stone is a cross-slab, roughly triangular in shape and modest in scale, measuring just 56 centimetres high and 31 centimetres wide. What makes it quietly arresting is its material as much as its carving: it is cut from garnet mica-schist, a metamorphic rock with a faintly glittering surface, and on one face, above the butt end, a carved expansional Latin cross sits within a framed band, its centre ovoid and its terminals D-shaped. The expansional form means the arms of the cross flare slightly outward at their ends, a detail common in early Irish stonework and one that rewards close looking.

The slab was recovered from the paved floor of a structure known as Cell A, one of the clochans associated with the High Island monastery. A clochan is a dry-stone corbelled hut, a building technique used by early Christian monks in Ireland in which flat stones are layered in overlapping rings until they close into a beehive dome, requiring no mortar. That a decorated cross-slab had been set into the floor of such a cell is itself an unusual circumstance, and the High Island site produced a second slab from the same context. Fisher, writing in 2014, recorded this stone as number 32 in a catalogue of the island's carved stonework, placing it within a broader study of one of the more isolated and least-visited monastic sites on the western seaboard. How and when the slab made its way from High Island to its present location at Raheen is not detailed in the available record, but its displacement is a reminder of how much early medieval material has shifted over centuries, moved by collectors, clergy, or simple necessity.