There is an interesting new paper from Ixer and Bevins on stone axe fragments from the Stonehenge landscape -- available to read via the Academia web site:
Recently found polished stone axe fragments from the Stonehenge Landscape; expanding the range
by Rob A. Ixer and Richard E. Bevins
Wiltshire Archaeological & Natural History Magazine, vol. 111 (2018), pp. 73–83
This is the Abstract:
Two gabbro fragments and a lithic tuff axehead found within secure prehistoric contexts at West Amesbury Henge, a probable prehistoric gabbro fragment from The Stonehenge Avenue and an uncontexted gabbro fragment from a test pit in the Cursus Field, have been petrographically investigated. They add to the surprisingly few axe fragments that have been recovered within the Stonehenge Landscape. Petrographically, all ﬁve artefacts are dissimilar to each other and to any recognised Implement Petrology Group axe group including Groups I–IV, XII, XIII, XVI and XXIIIb. They are also dissimilar to any modern roadstone found in the area. No precise geographical provenance is suggested but at least one may have a (west) Cornish origin. Basic and intermediate rocks (gabbros, dolerites, basalts; granodiorites and andesites) are the main igneous rock types that occur (in small numbers) randomly throughout the Stonehenge Landscape. None of the lithologies are ‘preselite’ (spotted dolerite) or any other bluestone, as currently deﬁned and almost all of them occur in insecure or modern contexts.