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QX3 Digital Image Gallery
Darkfield Illumination
Bauxite
Recovered from Joplin, in Jasper Country, Missouri, this thin section of bauxite reveals very fine-grained brownish-gray aggregates of chalcedonic quartz, scattered specks and aggregates of slightly coarser quartz, and irregular stringers and blebs of translucent to opaque organic material. The thin section also contains patches and grains of calcite.
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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