Orthorhombic Crystal of Topaz
This form shows the fundamental prism (p) on a crystal of topaz, in combination with another prism, (p’); the basal pinacoid, (c); the brachydome, (g); and the four pyramids, (o), (o’), (o’’), and (x).
Keywordspyramid, crystal, prism, crystallography, pinacoid, brachydome, basal pinacoid, fundamental prism
George Huntington Williams, Ph.D. Elements of Crystallography for Students of Chemistry, Physics, and Mineralogy (New York, NY: Henry Holt and Company, 1892)