Quartz

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	SEM backscattered electron image of rock flour from the FN survey near FN12 in the Southwestern Branch on the way to Big Sky camp. Sample contains predominantly quartz (Si, O on EDS analysis) with small inclusions of possible zirconium (O,Si,Zr) and rutile (Ti,Si,O). Photo by Spilde, Northup, and Boston.
	SEM image of white corrosion residue (sample SW8) from the FN Survey (FN18) in the Southwestern Branch on the way to Big Sky camp. EDS analysis reveals that these are quartz grains with a dusting of cubic minerals 2-7 microns across. The grains are angular but not always cubic. Photo by Spilde, Northup, and Boston.
	SEM closeup of the preceding image. Photo by Spilde, Northup, and Boston.

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