Commercial chalk for kids composition I have no background in chemistry whatsoever. However, I'm very interested in sidewalk chalk composition. I read that chalk can be both either made out of gypsum or chalk (calcium carbonate). However, I'm confused, since a person that it is connected to a chalk (final product) manufacturer told me that the main ingredient in their product (chalk for kids) is sulfuric acid carbon. 

As I said, my knowledge in chemistry is very reduced. I was just hoping that someone that knows well the subject can say if there can be a connection between the sulfuric acid carbon and gypsum.
I am afraid whoever told you "sulfuric acid carbon" does not know the basic terminology (must be from non-chemistry background). There is no such thing as "sulfuric acid carbon" to begin with. Any carbon obtained by charring with sulfuric acid would be jet black. Nobody would like to have a black chalk.

It is very easy to parse $\ce{CaSO4.2H2O}$ incorrectly. 

I think he/she misread the calcium $\ce{Ca}$ symbol for carbon which is $\ce{C}$. 

$\ce{SO_4^2-}$ can be easily misrepresented to be sulfuric acid.