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Bartonite: K3Fe10S14
Comments: B&W polished section image showing an irregular remnant of bright pyrrhotite (py) in a matrix of bartonite (ba) veined by silicates. (AmMin, v66:369). Location: Found in a mafic, alkalic diatreme at Coyote Peak, Humboldt County, California, USA. Scale: Picture Size 1.3? x 1.94 mm. © American Mineralogist