Ancient Martian brines left bromine rich fingerprints in jarosite minerals

Tokyo, Japan (SPX) Dec 14, 2025

Jarosite, a sulfate mineral widely detected on Mars, records interaction between acidic, oxidizing waters and the planet’s surface rocks, but the halogen chemistry of those fluids has been difficult to reconstruct. New experimental work examines how bromine and chlorine enter jarosite under Mars-like conditions, using them as tracers of fluid evolution and environmental conditions.

Researc