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UK | |
| Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp. Embrey, Peter G. (1978) Fourth supplementary list of British minerals. Mineralogical Magazine, 42 (322) 169-177 doi:10.1180/minmag.1978.042.322.01 Kingsbury, A.W.G. (1961) Beryllium Minerals in Cornwall and Devon: Helvine, Genthelvite, and Danalite. Mineralogical Magazine, vol. 32, n° 255, 921-940. |
| Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp. Embrey, Peter G. (1978) Fourth supplementary list of British minerals. Mineralogical Magazine, 42 (322) 169-177 doi:10.1180/minmag.1978.042.322.01 Kingsbury, A.W.G. (1961) Beryllium Minerals in Cornwall and Devon: Helvine, Genthelvite, and Danalite. Mineralogical Magazine, vol. 32, n° 255, 921-940. [Specimen in the Natural History Museum, London] |
| Kingsbury, A.W.G. (1961) Beryllium minerals in Cornwall and Devon: helvine, genthelvite and danalite. Mineralogical Magazine, 32, 921-940. |
| Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp. |