Hemimorphism in the Direction of the Axis of Symmetry
This figure shows hemimorphism in the direction of the axis of symmetry on a crystal of Pentacid Alcohol (C_6_H_12_O_5_). The forms on this crystal are (c), (p), (r), and (q).
George Huntington Williams, Ph.D. Elements of Crystallography for Students of Chemistry, Physics, and Mineralogy (New York, NY: Henry Holt and Company, 1892)