You might have better luck finding it if you used "goofer dust".
According to Lucky Mojo - which is the best site I've found on Hoodoo and Rootwork: "Recipes for making it vary, but it is almost always a mixture of simple natural ingredients, usually including Graveyard Dirt, powdered sulphur (which can give it a yellowish colour) and salt. Subsidiary ingredients may include powdered snake heads or snake skin "sheds," red pepper, black pepper, powdered bones, powdered insects or snails, and greyish, powdery-surfaced herbs such as mullein and sage. In the past, some formulas for Goofer Dust included anvil dust, the fine black iron detritus found around a blacksmith's anvil. A modern substitute for this now-uncommon ingredient would be magnetic sand, which is also black in color."
You can check out the site at http://www.luckymojo.com/catalogue.html