Update on the possible provenancing of the recumbent .

The original analysis of the recumbent from Childe's excavation was done Dr R.Campbell he suggested “ sillimanite gneiss” . He added “The recumbent stone is not of local origin .Similar rocks occur in the Don valley between Kemnay and Tilliefourie .” There is no detail explaining his analysis or mention of thin sections .
It turns out there was an NMS geological survey in 2006 (not mentioned in Canmore ) which disagreed with the original findings concluding that the recumbent was “foliated granite “ .

I had contacted the best and he had very kindly offered a cut price analysis of thin sections , this would have solved a big part of the puzzle , but no removal of material is allowed .
So , a bit of an impasse .