What is the chemical formula for Gold(I) oxide?

Au2(SiO3)3 is a good guess for an imagianry compound. Gold silicates are not known. This would require the reaction of gold(III) oxide with silica- as gold(III) oxide decomposes at 160 0C what you get with silca are lovey ruby glasses or cranberry glasses that contain colloidal gold metal. In nature gold is found as small particulates in some silicate rocks.