Stele in basalt (H. 0.94 Br. 0.30 D. 0.22) found in the centre of the cella.
The stele is decorated on three sides with reliefs; the back is partially rough. The reliefs are divided into two parts by a horizontal rim.
AThe front has the form of an aedicola. In a niche with two Corinthian columns is the representation of Mithras' rockbirth. In his upraised hands a torch (l.h.) and a knife (r.h.); no Phrygian cap. The pediment has on its cornice an inscription, which is continued on the horizontal rim and on the pedestal. In the pediment a leaf ornament.