Alpeite

Alpeite (IMA symbol: Apt ) is a calcium manganese magnesium silicate mineral with the chemical formula Ca$4$Mn$3+$$2$Al$2$(Mn$3+$Mg)(SiO$4$)$2$(Si$3$O$10$)(V$5+$O$4$)(OH)$6$. It is named for its type locality, the Monte Alpe mine in Italy.