Chromium

Abundance: % (surface)

Chromium (periodic table symbol: CR, The most common stable isotope is ⁵²Cr.

Chromium is one of the main additives to many stainless steels. It can reach 25-30% by mass of stainless steel.

Production of stainless steel on Mars would require chromium. As the cosmic abundance of chromium is fairly high, it should be available on Mars.