aplite
/ˈaplʌɪt/(also haplite) Geology
noun
An igneous rock with a homogeneous fine- or medium-grained texture consisting predominantly of alkaline feldspar and quartz, typically pale in colour and most commonly found in dykes and veins in association with granite.
Origin
Mid 19th century; earliest use found in J. Beete Jukes (1811–1869), geologist. From ancient Greek ἁπλοῦς (with reference to the simplicity of its composition: see haplo-) + -ite, after German Aplit, itself after either Swedish aplit or post-classical Latin aplites.