Please be sure to read the profile before purchasing. This is Nanto Pegmatite from Nanto City, Toyama Prefecture. After collection, it has been washed and dried in the sun. It contains a higher dose of radiation than general medicinal stones. This is a genuine product, with the dose measured with a Geiger counter during collection. At this level, radiation is constantly being emitted. Above all, rare earth minerals are attached to the entire surface. The black or reddish-black parts in the image are not dirt, but rare earth minerals or due to exposure to rare earth minerals. I have been collecting this for many years, and it is very rare. Nanto City is a production area for euxenite, allanite, and zircon, and is introduced in Dr. Otokichi Nagashima's books. In my subjective opinion, it is better to use it for drinking water or for the affected area rather than in the bath. Of course, you can also use it in the bath. Maintenance is simply washing the stone and drying it in the sun once a week. Pegmatite is more fragile than granite, so please wash it with a soft brush. You can use it forever just by doing proper maintenance. I will respond to your questions to the best of my ability. If you don't know what to buy, please consult with me. This is something you can use for a long time once you buy it, so please purchase it after you are satisfied. I started finding and collecting it in November 2020. Since then, I have found new layers and collected them. The collection site is a cliff in the mountains, so there is a limit to how much I can collect by hand. This is for those who are in need only. Only those who can make a smooth transaction are welcome. Please refrain from price reductions. I have many other items for sale. Please take a look at the list of products. For genuine medicinal stones, please use the Doctor Stone Group. #Radium #RadiumOre #MedicinalStone #Hormesis #WarmUp #SensitivityToCold #ImmunityBoost #Detox #MedicinalStone ← You can see a list of group products.