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pitchstone; dark brown-black, porphyritic, with phenocrysts of plagioclase, pigeonite, ferroaugite, orthopyroxene, titanomagnetite and ilmenite, with small agate-filled amydgdales

Ben Hiant, Ardnamurchan, [Highland], [Scotland] lava in vent of Centre 1, [Palaeogene] Pyroxenes apparently show coarse exsolution textures indicating period of slow cooling at depth.