Minerals examined under magnification & polarized light

These two pictures were made of a cephalapod fossil featuring a nautiloid. This subject was initially found imbedded in rock(minerals), and then harvested from the dig. It was then prepared by grinding it down to an approximate thickness of 15-20um. The left photograph was made using a brightfield microscope using a 2x magnifying objective(lens). The right photograph was made using the same lens, however the illumination technique was changed to create polarized light. In polarized light microscopy, information about the subject can sometimes be observed. This might include the presence of bi-refringence compounds, which are materials with multiple refractive indices. This phenomena is observed as various colors. In geology and chemical microscopy applications, samples can sometimes be identified by the shape and the characteristic color of the crystal. This type of microscopy is also common in the world of forensic investigation.

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Fossilitorous_sandstone Lampriote Nepheline_synete alkalic_granite alkalic_syenite
alkalil_granite anorthosite bauxite biotite_granite biotite_hornblend_granite
biotite_hornblend_granite2 biotite_hornblend_granite3 carboweous_shale chert cherty_limestone

Photomicrography gallery index