Why isn't halite a gem?

Halite, or rock salt, isn't considered a gem primarily due to its softness and solubility in water, which limits its durability and suitability for jewelry. While it can exhibit attractive colors and crystal formations, its low hardness (2.5 on the Mohs scale) makes it prone to scratching and damage. Additionally, its lack of rarity and commercial value further distinguishes it from traditional gemstones.