aplite|ˈæplaɪt| var. haplite. 1879[see haplite].1923Nature CXII. 117/2 The well-known aplite from Meldon in Devonshire.1965G. J. Williams Econ.Geol.N.Z. xii. 181/2 Pegmatites, and possibly aplites, are also represented and several large quartz lodes.