Halite And gypsum both kind distinct crystals that are really soft and therefore are quickly scratched. Licking a sample will rapidly distinguish the two, as halite has the exact same composition as desk salt and an exceedingly exclusive ‘salty’ flavor. For those who dislike the concept of licking mineral samples, https://www.propanraya.com/id/produk/eco-gypsum-ee-4050
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