Iodine crystals come in bluish-black or violet form with a metallic shine. When heated above 68°F, it turns into a violet gas and has a distinct odor. Chemical formula: I2.
Iodine crystals usually are available as bluish-black or violet crystals that have a metallic luster. In its gaseous state (iodine converts to a gas at temperatures above 68°F), iodine is violet in color. Typically, iodine emits a sharp, distinct odor.
Formula: I2