Found a weird way to clean a really dirty calcite sample from a cave in Kentucky
I had this calcite piece from Mammoth Cave that was covered in a thick, dark mud film. Soaking it in vinegar, the usual trick, just made it fizz and left a chalky mess. On a whim, I tried a 50/50 mix of water and hydrogen peroxide in a plastic tub for about two hours. The mud just lifted off in sheets without touching the crystal faces. Has anyone else found a good cleaning method for delicate minerals that won't dissolve in acid?
So the secret to cleaning cave mud is basically just the same stuff I use on a bad stain in the laundry... that's kind of perfect. Guess my next mineral hunt will be in the laundry room.