The emergence of biomolecular homochirality requires both an initial symmetry-breaking event and a mechanism to amplify and preserve a chiral imbalance.
![Magnetite formation under prebiotically plausible conditions. a Envisioned evaporative lake setting on early Earth, where magnetite likely formed via authigenic precipitation facilitated either by solar irradiation or nitrogen oxide from the decomposition of abiotic nitrogen fixation products [62]. As these magnetite particles form, they acquire a natural remanent magnetization under the geomagnetic field. b Experimental setup used to reproduce early Earth conditions and investigate magnetite formation under UV-facilitated synthesis (samples UV1 to UV3) and c via nitrite oxidation of Fe(II) (samples NUV8 and NUV9). Samples NUV5 to NUV7 were synthesized by mixing Fe(II) and Fe(III) with different proportions (10%/90%, 50%/50% and 90%/10% of Fe(II)/Fe(III), respectively). -- physics.chem-ph](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/05/Prebiotic-magnetite.png?resize=1200%2C721&ssl=1)
The emergence of biomolecular homochirality requires both an initial symmetry-breaking event and a mechanism to amplify and preserve a chiral imbalance.