Rutile needles exsolved on the surface of a biotite grain from the Devonian-aged Tioga bentonite exposed in Seven Fountains, VA.
Sample provided by Dr. Dan Doctor, US Geological Survey.
Coal and pyrite from the lowermost Mississippian strata on Corridor H.
To explore a gigapan of the roadcut from which this sample was collected, click here:
To explore this slide in XPL, click here:
To view this thin section in XPL, click here:
To explore this thin section in PPL, click here:
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