Lets make this clear.
99.5% or purer Sodium Chloride with no additives.. It doesn't matter if its gems, granular or rocks. Granular is the fastest to dissolve, The others require more brushing. All Sodium Chloride salt, regardless of whether it is in a Morton's, Diamond Crystal, or generic is salt. Some come in 40 lb bags, some in 50, some in 80, ahh, you get the point.
Scott