500
Slate: Very fine; Shale, Mudstone, or Siltstone
Quartzite: Med-Coarse; Quartz Sandstone
Gneiss: Med-Coarse; Schist, Granite, or Volcanic Rocks
Slate, Quartzite, and Gneiss...What is their grain size and what are their parent rocks?
(Yes I know this is a hard question but I chose this purposely so it can either destroy your team or for Y'all to win-Becca)