Scawt Hill is a volcanic plug in County Antrim, Northern Ireland, in the borough of Larne, 5 km from the village of Ballygally.

These minerals were formed when the existing chalk of the area was intensely altered by the intrusion of the feeder tube of an ancient volcano, now long since cooled and eroded to its roots.

This olivine dolerite plug is 270 m x 180 m wide and rises 30 – 60 m above the Cretaceous white limestone (chalk), although the Antrim plateau around it is typically basalt.

[1] Due to the volcanic intrusion the chalk around Scawt Hill has been transformed by high temperature and low pressure thermal metamorphism, developing the large and unusual range of calc-siliate minerals that have attracted interest.

[13] 17 September 1943 a Royal Air Force, Vickers Wellington (W5647) had departed from RAF Limavady on a training flight over the Irish Sea.