Photographs of representative skarn lithologies from Lewis. (a) Pyroxene skarn 18LEW33, containing clinopyroxene + hornblende with wispy plagioclase + K-feldspar segregations. Hand lens is 2.5 cm long. (b) Garnetite 17LEW18 (slab height is 4 cm), containing euhedral garnet and interstitial feldspar + quartz. (c) Boudinaged wollastonite ore 17LEW30 surrounded by wollastonite-grossular-clinopyroxene gneiss (field of view is 30 cm across). (d) Small slab of 17LEW30 under short-wave UV light, showing zircon at grain junctions (yellow), plagioclase (red), and wollastonite. Field of view is 12 cm across.