Gypsumi

Gypsumi is a mineral species in the sulfate group, defined by a hydrated calcium sulfate composition with natural variation in water content. The name Gypsumi reflects its relationship to gypsum while denoting a distinct mineral identity. As of recent mineral catalogs, Gypsumi is a proposed name awaiting formal approval by the International Mineralogical Association (IMA).

Chemically, Gypsumi is based on calcium sulfate with variable hydration, commonly represented as CaSO4·(1.5–2.5)H2O to reflect natural variability. It crystallizes in the monoclinic system and forms tabular to fibrous aggregates. Color is typically white or colorless, with pale tints from trace impurities. Mohs hardness is around 2; specific gravity near 2.3–2.5. Cleavage is perfect in one direction.

Gypsumi forms in evaporitic and diagenetic environments where sulfate-rich waters precipitate minerals from solution. It is often found with related sulfates such as gypsum and bassanite, and may occur in association with clays and carbonate minerals in arid basins, salt flats, and shallow marine sediments.

Economically, Gypsumi has limited direct use but may be processed for use in plaster and ornamental plasters where its hydration variability aids workability. In research settings, doped or synthetic variants are explored for luminescent properties and as low-temperature sorbents for trace contaminants.

Etymology emphasizes its link to gypsum; the suffix -mi marks its proposed status as a separate mineral species. The IMA has not universally approved Gypsumi, and its recognition depends on published type specimens and peer-reviewed validation of its diagnostic features.

Safety: like other sulfate minerals, Gypsumi dust can irritate the eyes, skin, and lungs; standard mineral-handling precautions apply.