The Collaborative International Dictionary of English v.0.48:
aplite \aplite\ n. 1. light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars. [WordNet 1.5]WordNet (r) 3.0 (2006):
aplite n 1: light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars