A glass composition is provided that includes SiO2 in an amount from 50.0 to 65.0% by weight; Al2O3 in an amount from 18.0 to 23.0% by weight; CaO in an amount from 1 to 8.5% by weight; MgO in an amount from 9.0 to 14.0% by weight; Na2O in an amount from 0.0 to 1.0% by weight; K2O in an amount from 0.0 to 1.0% by weight; Li2O in an amount from 0.1 to 4.0% by weight; TiO2 in an amount from 0.0 to 2.5% by weight, Y2O3 in an amount from 0 to 10.0% by weight; La2O3 in an amount from 0 to 10.0% by weight; Ce2O3 in an amount from 0 to 5.0% by weight; and Sc2O3 in an amount from 0 to 5.0% by weight. Glass fibers formed from the inventive composition may be used in applications that require high stiffness and have elastic modulus between 88 and 115 GPa. Such applications include woven fabrics for use in forming wind turbine blades and aerospace structures.