Is perchlorate also naturally occurring?

Yes. Even on Mars. Closer to home, Chilean nitrate fertilizer containing naturally occurring perchlorate has been widely used in American agriculture since the early 20th century. Though quantities used today are smaller than the amounts applied earlier in the...

What are perchlorate’s other uses?

Perchlorate is widely used by the military, NASA and the commercial space industry as an ingredient in solid rocket propellant (not “rocket fuel”) and explosives. The large amounts of oxygen in perchlorate make it an optimal oxidizer to help solid rocket...