Tourmaline

This crystal of Tourmaline exhibits hemimorphism in the direction of the vertical axis. Its forms are the prisms, (g), which as a result of hemimorphism, appear as a trigonal prism, and (a); the scalenohedron, (s), and the two rhombohedrons, (R) and (r), at the antilogue pole, while only (R) occurs at the analogue pole.

Keywords

Pole, crystal, prism, crystallography, scalenohedron, silicate, trigonal, analogue, antilogue, hemimorphism, rhombohedrons

Galleries

Crystals

Source

George Huntington Williams, Ph.D. Elements of Crystallography for Students of Chemistry, Physics, and Mineralogy (New York, NY: Henry Holt and Company, 1892)

Downloads

TIFF (full resolution)

3086×4372, 967.0 KiB

Large GIF

722×1024, 45.3 KiB

Medium GIF

451×640, 24.1 KiB

Small GIF

225×320, 10.7 KiB