Mascagnite

Mascagnite is a naturally occurring sulfate mineral. Its chemical formula is (NH4)2SO4, indicating it is ammonium sulfate. Mascagnite is typically found in volcanic fumaroles and as a sublimate, meaning it forms from the direct transition of a substance from a solid to a gas phase, and then back to a solid. It can also be found in arid cave environments and guano deposits.

The mineral is known for its colorless to white appearance, though impurities can sometimes impart a yellowish or greenish hue. It crystallizes in the orthorhombic crystal system. Mascagnite is relatively soft, with a Mohs hardness of about 2.5. It has a specific gravity of around 1.77. A notable characteristic of mascagnite is its salty taste and its high solubility in water.

Historically, mascagnite was first described in 1871 and named in honor of Italian chemist Carlo Mascagni. While not a primary ore of any valuable element, its presence can be indicative of certain geological conditions, particularly volcanic activity. It can also be a component of industrial byproducts, though natural occurrences are its defining feature. Due to its solubility, it is not typically found in large, stable mineral deposits exposed to weathering.