Carved into the garnet mica-schist is a circle divided into eight equal segments by two interconnected Greek crosses, the arms of equal length, forming a kind of geometric wheel. At the centre of that wheel sits a smaller roundel containing yet another incised Greek cross. The overall effect is precise and deliberate, a piece of early medieval geometry executed in stone by someone who knew exactly what they were doing.

The slab was found on High Island, a site with a cluster of early Christian remains, close to a structure known as 'Cell B', a clochan, which is one of those dry-stone beehive huts associated with early Irish monasticism. Nearby is a leacht, a low cairn or platform of stones that typically served a commemorative or devotional function in early Irish monastic contexts, often marking a burial or serving as a focus for prayer. The cross-slab appears to have been discovered overlying one such leacht, and it is thought that it may once have stood upright on or directly beside it, functioning as a modest grave or memorial marker. The stone itself is irregular in shape, which sets it apart from more formally dressed slabs, though the carving on its single decorated face shows no lack of care or intention.