Two papers to download for those seriously interested in the stones of Stonehenge:
A detailed re-examination of the petrography of the Altar Stone and other non-sarsen sandstones from Stonehenge as a guide to their provenance
by Robert Ixer
DETAILED PROVENANCING OF THE STONEHENGE DOLERITES USING REFLECTED LIGHT PETROGRAPHY -A RETURN TO THE LIGHT
by Robert Ixer
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