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Pisanite from Parys Mountain, Anglesey

Published online by Cambridge University Press:  14 March 2018

Leslie Bor
Leslie Bor*
Affiliation:
Department of Geology, Manchester University
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Extract

During the Manchester University's 1946 geological excursion to Anglesey, a visit was made to Parys Mountain. At this locality small quantities of an attractive light blue mineral were found capping pyrite veins and in clefts in the rock. Larger finds were obtained in an artificial cavern which extended for fifty or sixty feet into the south-east side of the excavated pit. A specimen weighing 2½ pounds and consisting of silicified shale veneered with the pale blue mineral was collected by the author and examined in the geological research laboratory at Manchester University during the session 1948–1949. The blue mineral was identified as pisanite, and this is the first record of pisanite as a British mineral.

Parys Mountain is situated in the north-west of Anglesey close to Amlwch. Copper and to a smaller extent lead were mined throughout a period exceeding one hundred and fifty years, but operations have completely ceased since the first world war. The geological structure of the district need only be briefly outlined for the purpose of this study.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 208 , March 1950 , pp. 63 - 67
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1950

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References

Page 63 note 1. E. Greenly, The geology of Anglesey. Mem. Geol. Surv., 1919, vol. 2, pp. 561 and 823. [M.A. 1-328.]

Page 65 note 1. E. S. Dana, A textbook of mineralogy. 4th edition, 1932, pp. 761-762. [M.A. 5-193.]

Page 65 note 2. A. N. Winehell, The microscopic characters of artificial inorganic solid substances or artificial minerals. 2nd edition, 1931, pp. 231-232. [M.A. 5-2.]

Page 66 note 1. Church, A. H., Min. Mag., 1895, vol. 11, p. 13.CrossRefGoogle Scholar

Page 66 note 2. Cameron, F. K. and Robinson, W. O., Journ. Phys. Chem., 1907, vol. 11, p. 641.CrossRefGoogle Scholar

Page 67 note 1. Posnjak, E. and Mervin, H. E., Journ. Amer. Chem. Soc., 1922, vol. 44, p. 1965.CrossRefGoogle Scholar [M.A. 2-21.]