Pyrrhotite

Field of view: 50 mm. Pyrrhotite beds. The yellow parts with a metallic luster are pyrrhotite. The surrounding black host is shale. Note that pyrrhotite distributes as beds parallel to the bedding planes of shale.

Recovered from shale, a matrix of an accretionary complex. near a chert-hosted bedded manganese deposit subjected to Albite-Epidote-hornfels facies contact metamorphism.

Pyrrhotite from this location was described in 2012.

The existence of pyrrhotite may indicate that this deposit has been metamorphosed under higher temperature condition (more than 325 degree, for example) than pyrite-bearing deposits.