Manganese in Corrosion Residues

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	SEM image (900x) of black corrosion residue from Snowing Passage, Southwest Branch. EDS analysis shows the filaments to be composed of manganese oxide. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	Closeup SEM (1700x) image of black corrosion residue from Snowing Passage, Southwest Branch. EDS analysis shows the filaments to be composed of manganese oxide. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	EDS spectrum of black corrosion residue from Snowing Passage, Southwest Branch, Lechuguilla Cave. Samples are Au-Pd coated. Analysis by Diana Northup and Mike Spilde.
	Closeup SEM image (8500x) of filaments in black corrosion residue from Snowing Passage, Southwest Branch. EDS analysis shows the filaments to be composed of manganese oxide. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	Closeup SEM image (16000x) of filaments in black corrosion residue from Snowing Passage, Southwest Branch. EDS analysis shows the filaments to be composed of manganese oxide. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	SEM image (950x) of overview of fibers and filaments in black corrosion residue from Snowing Passage, Southwest Branch. EDS analysis shows the filaments to be composed of manganese oxide. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	Closeup SEM image (5500x) of filaments in black corrosion residue from Snowing Passage, Southwest Branch. EDS analysis shows the filaments to be composed of manganese oxide. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	Closeup SEM image (9000x) coarsely crystalline manganese oxide in black corrosion residue from Snowing Passage, Southwest Branch. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	SEM image (4300x) of fuzzy mineral region in black corrosion residue from Snowing Passage, Southwest Branch. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	SEM image (100x) of black corrosion residue from Snowing Passage, Southwest Branch. Smooth areas with filaments are rich in manganese oxide while the rough, rubbly areas are high in iron oxides. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	Closeup SEM image (7500x) of rubbly area in previous image of black corrosion residue from Snowing Passage, Southwest Branch. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	SEM image (9500x) of red-brown corrosion residue from Snowing Passage, Southwest Branch. The tissue paper-like material is composed of manganese oxide, while the more rubbly material is iron oxide. Samples are Au-Pd coated. Photo by Diana Northup and Mike Spilde.
	SEM image of black corrosion residue from EY56, Western Borehole. Photo by Spilde, Northup, and Boston.
	EDS spectrum of black corrosion residue from EY56, Western Borehole. Note presence of manganese peak. Samples are Au-Pd coated. Analysis by Spilde, Northup, and Boston.
	EDS spectrum of black corrosion residue from EY56, Western Borehole. Note presence of rare earth elements associated with phosphorus. Samples are Au-Pd coated. Analysis by Spilde, Northup, and Boston.
	EDS spectrum of black corrosion residue from EY56, Western Borehole. Note presence of strong manganese peak. Samples are Au-Pd coated. Analysis by Spilde, Northup, and Boston.
	EDS spectrum of black corrosion residue from EY56, Western Borehole. Note presence of strong manganese peak and minor sulfur and magnesium peaks. Samples are Au-Pd coated. Analysis by Spilde, Northup, and Boston.
	EDS spectrum of black corrosion residue from EY56, Western Borehole. Note presence of manganese, sulfur, and magnesium peaks. Samples are Au-Pd coated. Analysis by Spilde, Northup, and Boston.

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