(Fe,Mn)₈Si₆O₁₅ (OH,Cl)₁₀

Pyrosmalite is a silicate of manganese and iron and also contains chlorine. Its composition is (Fe,Mn)₈Si₆O₁₅(OH,Cl)₁₀.

This sample is on display in the Smithsonian Museum of Natural History. Its source is listed as the Bjelke mine, Nordmark, Varmland, Sweden. The size of the sample is about 5x5 cm.

Mindat: Pyrosmalite