Terpene synthase that is able to convert geraniol diphosphate to geraniol in tea leaves. (2E)-geranyl diphosphate + H2O = (2E)-geraniol + diphosphate Binds 2 Mg(2+) ions per subunit. The Asp-Asp-Xaa-Xaa-Asp/Glu (DDXXD/E) motif is important for the catalytic activity, presumably through binding to Mg(2+). Belongs to the FPP/GGPP synthase family.