One at a time, you test how quickly each of the following substances will settle out of water. To measure this property, you separately test each of the following by placing 100 grams of the substance and 500 milliliters of water into a 1 liter jar and screw on the lid tightly. Then you shake the jar violently for 1 minute and set the jar down. Which one of the following would settle the fastest, creating the clearest water in the fastest amount of time?