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Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK

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Latitude & Longitude (WGS84): 54° 54' 37'' North , 5° 54' 55'' West
Latitude & Longitude (decimal): 54.91050,-5.91538
UK National Grid Reference:NW540573
Köppen climate type:Cfb : Temperate oceanic climate
Other regions containing this locality:North Atlantic Igneous Province

Contact-metamorphosed limestones and dolostones intruded by diabase.
Famous for being the type locality of various hydrated Ca-silicates.

Mineral List

29 valid minerals. 6 (TL) - type locality of valid minerals. 1 erroneous literature entry.

Rock Types Recorded

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Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

23.03 - 66 Ma

ID: 2036193
Unnamed Extrusive Rocks, Palaeogene

Age: Paleogene (23.03 - 66 Ma)

Lithology: Mafic lava and mafic tuff

Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Tilley, C.E. (1929) On larnite (calcium orthosilicate, a new mineral) and its associated minerals from the limestone contact-zone of Scawt Hill, Co. Antrim. Mineralogical Magazine, vol. 22, n° 125, 77-86.

Tilley, C.E. and Hey, M.H. (1930) Scawtite, a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine, vol. 22, n° 128, 222-224.

Tilley, C.E. and Harwood, H.F. (1931) The Dolerite-Chalk Contact of Scawt Hill, Co. Antrim. The Production of Basic Alkali-Rocks by the Assimilation of Limestone by Basaltic Magma. Mineralogical Magazine, vol. 22, n° 132, 439-468.

Tilley, C.E. (1933) Portlandite, a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine, vol. 23, n° 142, 419-420.

Tilley, C.E., Megaw, H.D., and Hey, M.H. (1934) Hydrocalumite (4CaO.Al2O3.12H2O), a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine, vol. 23, n° 146, 607-615.

Tilley, C.E. (1937) Wollastonite solid solutions from Scawt Hill, Co. Antrim. Mineralogical Magazine, vol. 24, n° 158, 569-572.

Tilley, C.E. (1942) Tricalcium disilicate (rankinite), a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine, vol. 26, n° 176, 190-197.

Tilley, C.E. (1948) On iron-wollastonites in contact-skarns: an example from Skye. American Mineralogist, 33, 736-738.

Tilley, C.E. and Vincent, H.C.G. (1948) The occurrence of an orthorhombic high-temperature form of Ca2SiO4 (bredigite) in the Scawt Hill contact-zone and as a constituent of slags. Mineralogical Magazine, vol. 28, n° 200, 255-271.

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