
Wiklundite

Wiklundite is a rare and complex arsenite-silicate mineral with the formula Pb2(Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2(Si,As5+O4)6(OH)18Cl6. The mineral characterizes in a large "c" unit cell parameter. It was found in Långban, Sweden - a home for many rare and exotic minerals.
Relation to other minerals.
Structure of wiklundite is unique. A slightly chemically similar mineral, although lacking manganese and iron, is hereroite.