Involved in the biosynthesis of furaquinocin. Catalyzes the transfer of a geranyl group to 2-methoxy-3-methyl-flaviolin to yield 6-prenyl-2-methoxy-3-methyl-flaviolin and 7-O-geranyl-2-methoxy-3-methyl-flaviolin in a 10:1 ratio. Can also use other substrates such as flaviolin or 1,3-dihydroxy naphthalene, and can also use DMAPP as prenyl donor. (2E)-geranyl diphosphate + 2-O,3-dimethylflaviolin = 6-linalyl-2-O,3-dimethylflaviolin + diphosphate (2E)-geranyl diphosphate + 2-O,3-dimethylflaviolin + H(+) = 7-O-geranyl-2-O,3-dimethylflaviolin + diphosphate Does not require any metal cations for activity. Monomer. Belongs to the aromatic prenyltransferase family.