Pyrite is a very common iron-sulfide ... It's also not surprising, observing the tiny glittering crystals embedded in a rock, that this mineral was and still so often confused with gold that ...

They recovered rocks from more than 100-feet deep to examine the shale bedrock and identify how deep or shallow pyrite weathers and fractures underground. Scanning electron microscope images of ...

Pyrite is an iron-sulfide mineral ... Gold is a surprisingly common metal, found in traces in almost all rocks, in water, and even in life-forms. However, its concentration is very low, making ...

Pyrite concretions are common in the Pennsylvanian shales immediately overlying the Bevier coal bed in north-central Missouri. They were studied in place in the shale and also with the microscope in ...