Minerals
Feodosiyite
feodosiyite
Cu11Mg2Cl18(OH)8·16H2O
Mineralatlas Lexikon - Feodosiyite (english Version) — via www.mineralienatlas.de · Source
Overview
Feodosiyite is a very rare chloride mineral, just recently approved, with the formula Cu11Mg2Cl18(OH)8•16H2O. Its structure is unique. Feodosiyite comes from the Tolbachik volcano, famous for many rare fumarolic minerals. Chemically similar minerals, chlorides containing both copper and magnesium, include haydeeite, paratacamite-(Mg) and tondiite.