color CL image of detrital quartz grains, quartz cement and a quartz in a fracature. This sample is from the Mt. Simon Fm. from northern Illinois. (color, 557 Kb) and includes an intergranular quartz-filled microfracture cutting across several well-rounded quartz grains. The black, euhedral shapes in the center of the microfracture are crystals of barite.

Originally uploaded in Integrating Research and Education:Geochemical Instrumentation and Analysis.

Image 10741 is a 577 by 340 pixel JPEG
Uploaded: Oct1 07

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