A Patite was first recorded from the Eskdale granite by R. H. Rastall and W. H. Wilcockson in 1915 (I).1 Recently, the author, in carrying out work on the granite, has noticed the peculiar character of the apatites, in that they are mostly of a dusky type occasioned by the presence of large amounts of finely-divided inclusions. Similar apatites have been recorded from the Leinster granite (2), Gault Clay, Thanet Sands, Chausey Islands (3), Jersey (4), the Old Red Sandstone of the Cardiff District (5), and the Dublin district (6), but nearly all show a sharply defined core. The Eskdale ones, although presenting a dense centre, show no clear-cut division between the core and the outer zone of the apatite. Invariably the outer zone of the apatite carries some inclusions.