Rough Rhodochrosite Uniqueness Guaranteed: Every item is one-of-a-kind, making them ideal for all projects or designs. Avg Size Range: (1 to 2 inches) Material Origin: (France) Rhodochrosite is a manganese-rich carbonate mineral, and this manganese gives the stone its rich rose-red color, which occasionally shades to brown when it oxidizes. Rhodochrosite is actually closely related to manganoan calcite, where much more of the calcite has been replaced by manganese. Custom Requests: Have specific preferences? Leave a message with your order, and we'll do our best to accommodate your requests if possible. Handmade items vary in size, shape, and color when selected randomly (the highest quality items are chosen first). They'll be as beautiful as those in the photos.