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| Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp. |
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| Elton, N., Green, D., Hooper, J., Weiss, S. (2004) Famous British Mineral Localities: Greystone Quarry, Lezant, Cornwall. UK Journal of Mines and Minerals 24, Rockbottom Publications. 9-28 |
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| Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp.
Betterton, J. (1989) Birnessite from Penberthy Croft Mine, Cornwall - a Second English Occurrence. Journal of the Russell Society, 2 (2) The Russell Society . 48 |
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| Tindle, Andy G. (2008) Minerals of Britain and Ireland. Terra Publishing. |
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| Embrey, Peter G. (1978) Fourth supplementary list of British minerals. Mineralogical Magazine, 42 (322) 169-177 doi:10.1180/minmag.1978.042.322.01
Jones, L.H.P., Milne, A.A. (1956) Birnessite, a new manganese oxide mineral from Aberdeenshire, Scotland. Mineralogical Magazine: 31: 283-288. |
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| Nicholson, K. (1989). Manganese oxides from the British Isles. Mineralogical Magazine, 53(373), 637-638. |
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| Notes about Gourock, chiefly historical By David Macrae |
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| Livingstone, Alec (2002) Minerals of Scotland - Past and Present. National Museums of Scotland Publishing Ltd., Edinburgh. |
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Penberthy Croft Mine, St Hilary, Cornwall, England, UK