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Tourmaline
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Description: "Hexagonal-rhombohedral; hemimorphic. Crystals usually prismatic, vertically striated. A triangular prism, with three faces, prominent, which with the tendency of the prism faces to be vertically striated and to round into each other gives the crystals usually a cross section like a spherical triangle. Crystals are commonly terminated by base and low positive and negative rhombohedrons; sometimes scalenohedrons are present. When the crystals are doubly terminated they usually show different forms at the opposite ends of the vertical axis." — Ford, 1912
Source: William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912)263
Keywords: geology, geometry, tourmaline, crystal, mineral
Copyright: 2009, Florida Center for Instructional Technology. See license.
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