Cerium Oxide is the #1 choice for polishing both hard rocks and soft rocks. It is pinkish-tan in color and 3-5 microns in size. It is an excellent polish for agates, quartz, quartz crystals, amethyst, jasper, petrified wood, feldspar and obsidian. Shipped in a 1-pint plastic container with a snap-on lid. This is 1.0 pounds of optical grade Cerium Oxide powder, at $20.38 per pound.