Where to find gypsum

[hukdizzle]

My LHBS doesn't open till 10AM and that's just too late, I gotta get some gypsum somewhere else. Anyone know where I can find it?

 

[conpewter]

You could probably find it at a garden center.

 

[Boerderij_Kabouter]

drywall???

This sounds like a bunch of gypsum and pony rides to me.

 

[giligson]

Isn't plaster of paris also Gypsum (with more H2O in the molecule?)

 

[hukdizzle]

Eh it may be, but would it be food service grade?

 

[ChshreCat]

According to Wikipedia:

Deposits are known to occur in strata from as early as the Permian age.[5] Gypsum is deposited in lake and sea water, as well as in hot springs, from volcanic vapors, and sulfate solutions in veins. Hydrothermal anhydrite in veins is commonly hydrated to gypsum by groundwater in near surface exposures.

Hope that helps.