Why does quartz have ploymorphs? What is a polymorph?
a. Your instructor is probably looking for beach as an answer. I am unsure of what clear means unless the quartz grains are like glass clear. But, beach sands can be very smooth and rounded as they have been tumbled on the beach for years. b. Pitted (frosted) grains are normally attributed to dune sands. However, many dune sands are not pitted. c. In order to get a sand grain scratched, it must be held in place and other grains are drawn across it. This is most likely created at the base of glacial ice as it scours rocks and sediments on its way down a mountain valley.
