The research concludes that the six-tonne Altar Stone at the heart of the ancient site was not sourced from Mainland Orkney but elsewhere within north-eastern Scotland.
The new study’s lead author, Professor Richard Bevins from Aberystwyth University, has been investigating Stonehenge for the past 15 years.
He said: “The mystery of where the stone came from is becoming clearer and clearer as we begin to rule out specific areas in north-east Scotland.
”This research is radically changing our thinking about the origins of the Altar Stone. It’s thrilling to know that our chemical analysis and dating work is slowly unlocking this great mystery.
“The Altar Stone is anomalous in many ways to both the bluestones and the sarsens at Stonehenge.
”Whilst, at six tonnes, it is nowhere near the size of the sarsens, it is substantially larger than the bluestones, with which it has previously been classed.
”It lies in an unusual position at the monument, occupying a near central location and not within either the Bluestone Circle or the Bluestone Horseshoe. It is also grey-green sandstone, unlike all the other bluestone rock types.
“As an academic, I have been fascinated by Stonehenge for decades. I and my other colleagues in the team will continue to work to pin down where exactly in the north-east of Scotland the Altar Stone came from.”
The new research adds to findings by Aberystwyth University and other UK and Australian scientists publishEd last month in Nature, concluding that the Altar Stone came from north-eastern Scotland.
This built on previous Aberystwyth University research that ruled out its Welsh origins and suggested that it should no longer be classified as a bluestone.
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