[Edi]

Marble Oracle is indeed a stonebeing. There's a list of units with the stonebeing flag in the 3.10 Dom3 DB thread. The information was supposed to have been added to the DB already, but had been left out. It has been updated for 3.17. There's maybe a dozen of them all told, but the Agarthan statue summons are all stonebeings. Monolith, Sacred Statue, Gargoyle, Living Statue and Crusher were some of the others.