1310 Pseudo-Geber, an anonymous Spanish alchemist who wrote under the name of Geber, publishes several books that establish the long-held theory that all metals were composed of various proportions of sulfur and mercury.
Pseudo-Geber, un alchimist spaniol anonim, ce a scris sub numele Geber, publică numeroase cărți care stabilesc teoria că toate metalele erau compuse din variate proporții de sulf și mercur.