How certain are we of this being made of Schist? And if so what kind of Schist?
Are there any signs or indications of saw or chisel marks?
Is there any possibility that it is made from a geopolymer concrete? The ancients seem to have had knowledge of such techniques (e.g. Pyramid casing stones). This may be completely unrealistic but I'm curious.
Does this type of material have any unusual or distinctive properties? I'd be curious to see how it would react to certain sound frequencies, vibrations, light and air. Can it direct/ concentrate/amplify heat, air or sound. To me it seems too fragile to be rotating in water. It's slight resemblance to a speaker drum leads me to assume sound pressure was involved.
Edited 1 time(s). Last edit at 26-May-18 21:05 by seanoffshotgun.