Quartz from St Day, Cornwall, England, UK

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UK
England Cornwall St Day Busveal ⓘ Cathedral Mine	Robin Selley and Roger Eslick (2004) Cathedral Mine. BMS Newsletter 68:13-14 Dines, H. G. (1956) The Metalliferous Mining Region of South-West England (1st ed.) Vol. 1. Geological Survey of Great Britain, London.
St Aubyn United Mines (Grambler and St Aubyn Mines) ⓘ Wheal Grambler (East Wheal Sparnon)	[var. Amethyst] Paul De Bondt collection
Treskerby ⓘ Park-an-Chy Mine	Dines, H. G. (1956) The Metalliferous Mining Region of South-West England (1st ed.) Vol. 1. Geological Survey of Great Britain, London.
ⓘ Wheal Gorland	Kingsbury, Arthur W. G., Hartley, J. (1960) Carminite and beudantite from the northern part of the Lake District and from Cornwall. Mineralogical Magazine and Journal of the Mineralogical Society, 32 (249) 423-432 doi:10.1180/minmag.1960.032.249.01 Russell, Arthur (1911) On the occurrence of Phenacite in Cornwall. Mineralogical Magazine and Journal of the Mineralogical Society, 16 (73) 55-62 doi:10.1180/minmag.1911.016.073.08 Hill, J. B., MacAlister, D. A. (1906) The Geology of Falmouth and Truro and of the Mining District of Camborne and Redruth. Memoirs of the Geological Survey. Geological Survey of Great Britain Miers, H. A. (1894) Spangolite. Mineralogical Magazine and Journal of the Mineralogical Society, 10 (48) 273-277 doi:10.1180/minmag.1894.010.48.02