Copper Silicate Showing Rhombohedral Tetartohedrism In the Hexagonal System

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This is a crystal of Copper Silicate (Dioptase) with a rhombohedron of the third order, (s), in combination with the prism of the second order, (m), and the negative rhombohedron, (r). This crystal is an example of rhombohedral tetartohedrism in the hexagonal system.




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


TIFF (full resolution)

2318×3848, 1014.1 KiB

Large GIF

616×1024, 59.3 KiB

Medium GIF

385×640, 28.0 KiB

Small GIF

192×320, 11.0 KiB