Dust

Dust is a source of energy in Remnant. The physical properties of Dust make it incredibly useful for a variety of purposes, particularly in the weapons of many characters in the series.

(Information)
Dust is known as a naturally occurring, crystallized energy propellant triggered by the Aura of Humans and Faunus.

Types of Dust
Dust can be found in four basic types. These four types can be combined both artificially and naturally to form other types of Dust, each with their own unique properties.
 * Wind - white
 * Water - light blue
 * Ice - dark blue
 * Fire - red
 * Earth - green
 * Lightning - yellow

Uses
Dust is most commonly used in combat as bullets. It can also be used in its raw/powdered form but this is harder to control. Dust can be sewn into clothes or embedded into weapons.