11. Chlorine is very rare in lunar regolith , so the design recycled it. 12. Ida's regolith is composed of the silicate minerals olivine and pyroxene. 13. Its small size would make the formation of significant amounts of regolith impossible. 14. Regolith can vary from being essentially absent to hundreds of metres in thickness.15. In less arid regions, however, the regolith profile can vary considerably. 16. Analysis of the plume observations supports the presence of water in the regolith . 17. They also took some rake samples, netting 78 fragments from the regolith . 18. The limiting element was Chlorine, an essential element to process regolith for Aluminium. 19. This contrasts with Ida, which is covered by a deep layer of regolith . 20. Regolith is also important to engineers constructing buildings, roads and other civil works.
