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III.—Axinite Veins in the Penmaenmawr Porphyrite
Published online by Cambridge University Press: 01 May 2009
Extract
In the course of a visit to North Wales last summer my friend Mr. Ivor E. Davies, of Penmaenmawr, called my attention to a mauve mineral, forming thin veins, in the intrusive porphyrite of Penmaenmawr Mountain. The specimens containing the veins were not seen in place, but were collected from the waste-heaps of the Graig Lwyd Quarries, the most easterly of the large quarries that are making such deadly inroads into the heart of the mountain. Careful search on the waste-heaps enabled us to collect further specimens, and in some of these the mineral had built in fissures and cracks somewhat crowded, very sharp-edged crystals of tabular development.
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References
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