32O'Sullivan, Jerry, and Tomás Ó Carragáin. Inishmurray: Monks and Pilgrims in an Atlantic Landscape. Cork: Collins, 2008. 103.
The round stones on the Clocha Breaca are made of sandstone and range in size from around 15–50 cm (6–20 in). William Wakeman, in 1892, reported finding only five decorated "cursing stones" on the altar: "Only five of the many altar-stones (sometimes styled "Cursing" or "Swearing Stones") remaining on Clochabreaca are decorated. In all cases the figure presented is that of a Greek cross, enclosed by a circle. Two of the examples which I shall first describe are highly ornate, so much so, indeed, that their design might form a valuable study to an illuminating artist intent on reproducing early Irish work of sacred, or simply decorative, character." (Wakeman, W. F., and James Mills. A Survey of the Antiquarian Remains on the Island of Inismurray. London: Williams & Norgate, 1893. 62-4.)