Melt 1 cup of white melt and pour soap base in a double boiler.
Add 1 tablespoon of coconut oil. Stir to combine.
Add a few drops of your favorite essential oil (optional). Stir to combine.
Add 3 capsules of activated charcoal powder or a drop/dash of soap coloring. Stir to combine.
Melt again in your double boiler if the base is too firm to pour.
Pour the soap mixture in a round or square mold. Let cool for 30 minutes.
Pop the soaps out of their molds. Cut the edges with a knife to make them look like rocks.
Dip a paint brush in rubbing alcohol or spray the soaps lightly. Dust with a thin layer of edible glitter dust or grey mica.