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What is the difference between natural gypsum and FGD gypsum

Gypsum,chemically known as “calcium sulfate dihydrate”, gypsum contains calcium, sulfur bound to oxygen, and water. Gypsum is an abundant mineral and takes forms including alabaster—a material used in decoration and construction as far back as ancient Egypt.This non-toxic mineral can be helpful to humans, animals, plant life, and the environment.
Flue-Gas Desulfurization (FGD) gypsum has been used to manufacture gypsum board for more than 30 years.  A by-product of desulfurization of flue gas from the stacks of fossil-fueled power plants, emissions captured from smoke stacks can be purified into a hard substance and manufactured into gypsum. Today, almost half of all gypsum used in China is FGD gypsum. Natural gypsum and FGD gypsum have the same chemical composition, they are calcium sulfate dihydrate (CaSO4·2H2O). FGD gypsum production and sales encourages power producers to capture “waste” for reuse, rather than merely storing it.
FGD gypsum is chemically nearly identical to mined natural gypsum, not only provides a wide-range of environmen friendly applications,but also widely used in agriculture,  highway construction, mining applications, cement production, water treatment and glass making.