
bentonite (clay) drilling mud fire clay chalk (other than writing) diatomite (not activated) molecular sieve pumice stone lens polishing powder (natural abrasives) marble (crude or roughly trimmed) marble sheet (roughly worked) marble tiles (roughly worked) marble (other than sheet and tiles) roughly worked granite slab rock boulders (natural)

ABSTRACT Utah offers spectacular geologic features and valuable analog environments and processes for Mars studies. Horizontal strata of the Colorado Plateau are analogous to Mars because the overprint of plate tectonics is minimal, yet the effects of strong ground motion from earthquakes or impacts are preserved in the sedimentary record.

Gyratory crusher - A machine that crushes ore between an eccentrically mounted crushing cone and a fixed crushing throat. Typically has a higher capacity than a jaw crusher. H. Halite - Rock salt. Hangingwall - The rock on the upper side of a vein or ore deposit. Head grade - The average grade of ore fed into a mill.