I looked all over the internet to find the type of mineral used in this crystal, and could not find it. Then, I ordered it assuming that I would find it on the actual label... but the ingredients aren't actually identified! I have found that some types of alum work better for me than others, so I will continue to use Crystal Body which has ammonium alum (vs. Naturally Fresh which has Potassium Alum). I prefer the look of the labeling on this product (no weird photos like on the Crystal Body label), but it isn't worth it to me to use a product that doesn't disclose its ingredients more specifically.