Stilpnomelane in North Wales


THE occurrence of stilpnomelane in Great Britain was first recorded by Hallimond1. He described the mineral from the Pen-y-rallt mine in Merionethshire, where it occurs in a pisolitic ironstone bed at the contact with “a mass of igneous rock”. The mineral occurs in association with chalybite in roughly parallel asbestiform veins up to one inch wide.

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    Hallimond, A. F., Min. Mag., 20, 193 (1924).

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    Cox, A. H., and Wells, A. K., Quart. J. Geol. Soc., Lond., 76, 296 (1920).

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    Bloxam, T. W., Amer. J. Sci., 257, 103 (1959).

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    Wager, L. R., and Deer, W. A., Medd. om Grönland, 105, No. 4 (1939).

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    Hutton, C. O., Min. Mag., 25, 172 (1938).

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    Fyfe, W. S., Turner, F. J., and Verhoogen, J., Geol. Soc. Amer. Mem., 73 (1958).

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    Woodland, A. W., Geol. Mag., 75, 366 (1938).

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BLOXAM, T., PRICE, N. Stilpnomelane in North Wales. Nature 190, 525–526 (1961).

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