Admontite is a hydrated magnesium borate mineral with formula MgB<sub>6</sub>O<sub>10</sub>÷7H<sub>2</sub>O.
Occurrence - In a gypsum deposit. Associations: gypsum, anhydrite, hexahydrite, löweite, eugsterite, pyrite, quartz.
It is named after Admont, Austria. Its Mohs scale rating is 2 to 3.