Symmetry of Rhombohedral Class Small 320×294 Medium 640×587 Large 1024×940 Download Tiff Original 2400×2202 | (348.4 KB) Description "The vertical crystallographic axis is one of trigonal symmetry, and the three horizontal crystallographic axes of binary symmetry." — Ford, 1912 Keywords class, geology, geometry, rhombohedral, symmetry Galleries Crystals Source: William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912) 41
