Geocerite is a rare mineral that belongs to the clay mineral group. It has the chemical formula Mg5Al2(OH)12[SO4]·6H2O, and it typically occurs as small, yellow-green to brownish-green aggregates or crusts in geothermal areas. Geocerite was first discovered in 1964 in the Kakkonda geothermal field in Japan, and it was named after its occurrence in geothermal areas (geo-) and its high cerium content (-cerite). Geocerite has a layered structure, and it contains both sulfate and hydroxide groups. It is formed by the alteration of primary minerals, such as olivine and pyroxene, in the presence of hot, acidic fluids. Geocerite is a rare mineral and has limited economic importance, but it is of interest to geologists and mineralogists as it provides insights into the chemical and physical conditions in geothermal systems.
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