Figure F29. Photograph of black calcite piece (interval 329-U1365E-5R-1, 0–5 cm) and photomicrographs of crystalline structure and composition (Sample 329-U1365E-6R-1, 5–8 cm). Photomicrographs are taken in plane-polarized light and reflected light at 5× and 20× magnification, respectively.
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