Welcome to DC!!
Here is a link to the recipe I use to make hard rock candy at Christmas. I use about half the oil the recipe calls for because I make spearmint or peppermint and I don't like it too strong. The recipe can also be used for lollipops.
Not sure how to make it opaque, but I'm sure someone will have some suggestions for you.
ETA: Here is a link to the Google search for "opaque hard candy recipe". I didn't take much time to look, but it seems pulling the candy can give the opaque look you were talking about. Not sure how that would work for lollipops, if at all.