Jarosite
Context: Recently, a team of researchers from around India sampled six jarosite veins from Kachchh in Gujarat, whose arid, salty terrain is similar to that of Mars.
Important Pointers:
What is Jarosite?: Jarosite is a yellow-brown mineral containing potassium, iron, and sulphate, often found in arid and salty terrains
Natural Geological Clock: It can act as a natural geological clock by storing energy from natural radiation and releasing it as luminescence.
Mars Connection: Commonly found on Mars, jarosite is considered a promising tool to date past Martian geological events like dust storms and volcanic ash.
Indian Study Location: Indian researchers studied jarosite veins from the Kachchh region in Gujarat, which resembles Martian terrain.
Luminescence Property: When stimulated by heat, jarosite shows four stable luminescence emissions at 100°C, 150°C, 300°C, and 350°C.
Radiation Resistance: Even after being heated to 450°C, jarosite retained its luminescence ability, showing it could survive rover drills.
Dating Range: With natural Martian radiation of 65 milligray/year, jarosite can record and date events from up to the last 25,000 years.
Technology Integration: Its properties make it readable with small heaters and LEDs, making it suitable for use in future Mars rovers.