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pitchstone; porphyritic with phenocrysts of quartz, feldspar, and clinopyroxene

[Roinn] Clumhach, [Isle of Bute], Strathclyde, Scotland sill:i: MANU HERRIOT, Alex late C20th East Kilbride Scotland "don. Elsa Henderson". Slide is evidently a replacement: original locality field reads "Scarp SW side of Glencallum Bay, Bute, S/C" and description reads "replaced J. L. Begs slice", but description appears not to have been updated. Slide number AH:459 from the collection bequeathed…