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felsite; porphyritic with phenocrysts of quartz, plagioclase and K-feldspar, and lobate basaltic enclave, with partially hybridized margin, and xenocrysts of quartz and feldspar

The Doon, Blackwaterfoot, Arran, [Scotland] loose, rockfall debris, but source seen about half-way up the central felsititc part of the sill, Palaeocene Drumadoon Sill, Very fresh for this locality - debris from large rockfall. Nice example of magma mixing.