Place ice in blender and pulse several times, to begin breaking it up.
Add raspberries, club soda, lemonade mix, 1 tablespoon lemon juice, and tequila and blend until thick and smooth, about 30 seconds.
Pour 1 tablespoon or so of lemon juice into a small saucer. In another saucer, pour a thin layer of salt (table salt, or kosher is even better). Dip the rims of the glassed in the lemon juice, then the salt.