Listingkriteeriumite

Listingkriteeriumite is a rare sulfate mineral that was first discovered in the 19th century. It is a hydrated iron sulfate mineral with the chemical formula KFe(SO4)2·4H2O. This mineral belongs to the mineral family of sulfates and is characterized by its monoclinic crystal structure.

Listingkriteeriumite is typically found in hydrothermal veins and sedimentary deposits. Its formation is often associated with the oxidation of iron-rich rocks and the subsequent interaction with sulfuric acid. The mineral has a distinct blue-green color and a vitreous luster. Its hardness is relatively low, ranking around 2 on the Mohs scale, and it is soluble in water.

The mineral has a number of unique properties that make it distinct from other sulfates. Its infrared spectra show a prominent absorption band at around 3400 cm-1, corresponding to the stretching vibrations of the hydroxyl groups in the water molecule. The mineral also exhibits a high degree of twinning, with many crystals displaying a characteristic "book" shape.

Listingkriteeriumite is a rare mineral that is found in limited quantities in certain parts of the world. Its discovery is often associated with the exploration of prospecting areas, particularly in regions with volcanic and hydrothermal activity. Despite its rarity, the mineral has been the subject of scientific study, with researchers investigating its crystal structure and chemical composition.