Eu'rite (ū'rīt) noun [ Confer French eurite .] (Min.) A compact feldspathic rock; felsite. See Felsite . 
Eurite is an acid, igneous rock of the granite group, which consists of quartz and feldspar with muscovite or garnet as accessory minerals, and is mostly found as dykes and veins traversing granite and crystalline schists.