Halite And gypsum both equally form apparent crystals that are incredibly smooth and so are conveniently scratched. Licking a sample will swiftly distinguish The 2, as halite has the same composition as table salt and a very unique ‘salty’ style. For people who dislike the concept of licking mineral samples, https://www.propanraya.com/id/produk/eco-gypsum-ee-4050