What is "sursassite"

n. (context mineralogy English) A monoclinic-prismatic mineral containing aluminum, hydrogen, manganese, oxygen, and silicon.

Sursassite is a sorosilicate mineral. It was first discovered in 1926. It was first found in the Sursass ( Oberhalbstein), a district of Graubünden, Switzerland. It is generally found in deposits of metamorphosed manganese.