Our Mama's Minerals brand Tin Oxide Rock Polishing Powder is 99.9% chemically pure and finely graded in the submicron size. An old-school favorite, this polish is great on a variety of quartz, jasper, and agates. It's also still one of the best for hand polishing glass by making a damp mixture and using leather or clean lint-free cotton. Use in step 4 of the tumbling process.1 lb. package.