Found during excavations on High Island off the Connemara coast, this cruciform cross-slab is modest in size, just 27 centimetres tall and 16 centimetres wide, yet its surviving decoration repays close attention. One face carries a grooved linear cross whose terminals branch into forks at the foot and sides and open into a wide semicircle at the top, a design that has a quiet geometric confidence to it. The side-arms are short and incomplete, with L-shaped or rounded armpits where the arms meet the shaft, and the shaft itself breaks off before reaching a full conclusion.

The material is garnet mica-schist, a metamorphic rock with a faintly glittering surface produced by the recrystallisation of older minerals under heat and pressure. That the carver chose this particular stone, rather than a plainer type, may reflect nothing more than local availability, though it gives the slab an added textural interest. High Island, known in Irish as Ardoileán, carries the remains of an early Christian monastic settlement, and it was during excavations around the island's church that this slab came to light. Cross-slabs of this kind are a familiar feature of early Irish monasticism, used variously as grave markers, devotional objects, or boundary stones, though their precise function in any given case is rarely certain. This example was catalogued by Fisher in 2014 and had previously appeared in the work of White Marshall and Rourke in 2000, suggesting it has drawn the attention of specialists for some time.