This cairn is not marked on O/S 1:25000 mapping which seems odd as it's on a path close to the Beacons Way path. It is however in an area rich with Bronze Age monuments, several of which (Upper Neuadd cairns, Cribyn) are intervisible with the cairn.
A stone cairn on the steep west-facing slope of Tor Glas. It is roughly 6m in diameter and 0.50m high situated on a slight terrace. On the northwest side the cairn had a possible edge or kerb to it but grass covering the edges obscured the detail.