Pyrite, Magnetite, Diopside, Quartz
Highway 28 road fill, Mayo Township, Hastings County, Ontario, Canada
Field of view about 7 cm.
Collected in 2000, it was covered in calcite and etched in dilute HCL. It contains pyrite (2cm), diopside (1.5cm), magnetite, and quartz. Although not in-situ it seems like it was a contact zone filled in with calcite if on a larger scale I would call it skarn. In the collection of the photographer.
© Matthew Neuzil