What is "sarkinite"

n. (context mineralogy English) A red, crystalline form of manganese arsenate, manganese₂²⁺(arsenicoxygen₄)(Ohydrogen); polyarsenite.

Sarkinite, synonymous with chondrarsenite and polyarsenite, is a mineral with formula Mn(AsO)(OH). The mineral is named for the Greek word σάρκιυος, meaning made of flesh, for its red color and greasy luster. The mineral was first noted in Sweden in 1865 as chondrarsenite, though not identified as Sarkinite until 1885.