Fortanium was a mineral used by the D'Arsay to build their archive in the center of a comet. The Federation was familiar with the mineral in the 2370s. (TNG: "Masks")

Minerals

Anorthosite • Antimonium • Bakrinium • Benamite • Beresium • Bernicium • Bilitrium • Boronite • Chrondite • Cormaline • Feldomite • Feldspar • Fortanium • Gallicite • Jakmanite • Jevonite • Kelbonite • Kemocite • Ladarium • Magnesite • Murinite • Neutronium • Nitrium • Noranium • Paralithium • Pergium • Regolith • Riddinite • Ryetalyn • Silithium • Styrolite • Talgonite • Topaline • Trellium • Tricyanate • Trimagnesite • Tritanium • Uridium • Vendarite • Zenite