Glass Compositions, Fiberizable Glass Compositions, and Glass Fibers Made Therefrom

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Glass compositions suitable for fiber forming having rare earth oxides (RE2O3) and glass fibers having a high modulus are disclosed. The glass composition may include SiO2 from about 44.5 to about 64 weight percent, Al2O3 from about 12 to about 32 weight percent, CaO from about 0.1 to about 15.5 weight percent, MgO from about 5 to about 22 weight percent, Fe2O3 less than 1 weight percent, TiO2 less than 2 weight percent, Na2O less than 3 weight percent, Y2O3 up to 12 weight percent, CeO2 up to 6 weight percent, ZnO up to 4 weight percent, and B2O3 less than 4.5 weight percent. The glass compositions can be used to form glass fibers and incorporated into various composites.