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QX3 Digital Image Gallery
Darkfield Illumination
Magnetite
This black granular magnetite-rich rock thin section contains many aggregates of the gray amphibole, grunerite. The grunerite mineral forms radiating aggregates of needles that are interconnected with irregular clumps of magnetite grains. Other minerals present in the rock include apatite, quartz, biotite, and carbonate.
Darkfield illumination digital images were captured using an Intel Play QX3 computer microscope modified for reflected light darkfield illumination. Oblique light was applied to the specimens using light pipes from a Dolan-Jenner Model 180 fiber optics illuminator containing a 150 watt projection lamp. The mixing chamber and diffusion screen were removed from the stage and a large piece of dark construction paper placed beneath the stage to avoid images of the paper being superimposed over the photomicrographs.
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