The stuff you set to the tumbler especially to shine the rocks in the ultimate stage will likely be made of cerium oxide, tin oxide, chrome oxide, or aluminum oxide. It is just a type of grit historically generally known as a polishing compound and is incredibly great. I have https://www.facebook.com/permalink.php?story_fbid=pfbid0Zkff5axPy6uAtu7ed6jL7bBkwRNQEiAdoff9FT6dTCiHjS7GfgNMKvgNrf2mHVSvl&id=61562415773754&__cft__[0]=AZUI90kXm6CF6WoBAoZpB--pN0ExuRPIfNrUipwWeTq75wQFBs2jd06YYlMjt9ypC06o0VzAripYTDyjtQ27LDW2agoiG8cq9hmV7HjUa7VSDgwTmV1UXdtYQdRO6BbQJ9t_ngaTGgccCTSq9QJEAIFpXosT23jashvb28TDuSJZb3q2jvmVkoRA73NDeQQCtly1ns3YbwrOOXRH2-Vp8O-t&__tn__=%2CO%2CP-R