RE:Chrome ore concentrates are not minerals Minings and chemicals ingineers also geological/mineral technologists may have perharps an answer at these links:
https://www.oreways.com/articles/the-science-behind-chrome-wash-plants.html?id=7
https://www.icdacr.com/about-chrome/chrome-ore/
https://www.fastmarkets.com/industrial-minerals/chrome-and-chromite/