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mullite; pink elongate crystals, with large twinned cordierite crystals, plagioclase, spinel, clinopyroxene, and sulphides

"American House", Kilfinichen Bay, Isle of Mull, Argyll and Bute, Scotland xenolith at top of sill, Palaogene Loch Scridain Sill Complex, A stunningly beautiful rock in thin section: mullites are very large and show lovely pink-colourless pleochroism; cordierites show a range of habits, but some are very large and fresh, with superb cyclic twinning.