Calcium

Electron Backscatter Diffraction (EBSD)

Inverse pole figure map overlaid on a image quality map of a calcite grain from a carbonaceous chondrite meteorite
[001] Inverse pole figure map (color) overlain on an image quality map (grayscale) of a calcite grain from a carbonaceous chondrite meteorite.
Orientation map of a brachiopod
Orientation map of a brachiopod (T. retusa). Brachiopods are marine invertebrates that have an extensive fossil record. They are a much used source of information on the composition and temperature of ancient oceans. The sample is entirely composed of calcite. The colors indicate slight differences in orientation.

Brachiopod

Courtesy of Martin Lee, Paul Dalbeck and Maggie Cusack, Division of Earth Sciences, University of Glasgow