Investigation of Eilean Mhuire, the most easterly island of the Shiant isles, off the west coast of Scotland, shows the presence of but one sill, which is thought to be the downfaulted top of the crinanite-picrite sill of Garbh Eilean-Eilean an Tighe. Rhythmic layering in the sill is accompanied by well-developed lamination resulting from planar orientation of pyroxene and plagioclase. An analysis of a pyroxene is given that shows higher SiO 2 and lower Al 2 O 3 than any previously analyzed from the Shiant isles. Changes in the textural relations of pyroxene and olivine can be observed, and seem to reflect a variability in the concentration of water.

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