All other isotopes of aluminium are radioactive. Essentially the most steady of such is 26Al, by using a 50 %-lifetime of 717,000 yrs: though it absolutely was present together with steady 27Al from the interstellar medium from which the Solar Method formed (think to have already been made by stellar nucleosynthesis https://aluminium-greenhouse89012.tinyblogging.com/facts-about-aluminium-greenhouse-revealed-81379551