Fig. 293 - Dana sets of wooden crystal models3D ModelNoAI
Fig. 293 - Dana sets of wooden crystal models
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Triangles: 142
Vertices: 73
More model informationIII. Hexagonal system
B. Rhombohedral division
2. Ditrigonal-Pyramidal class - 3m
Figure 293. Trigonal prisms {10-10} {01-10}, second-order prism {11-20}, positive trigonal pyramids {10-11} {40-41} {02-21}, negative trigonal pyramids {01-1-1} {10-1-2}, ditrigonal pyramids {12-32} {32-51}, pedion {0001} - Tourmaline
Dana sets of wooden crystal models, arranged by the late Professor William E. Ford to illustrate Dana’s Textbook of Mineralogy 4th edition (1932), originally produced by Dr. Krantz Rheinisches Mineralien-Kontor (Bonn).
Website: http://geology.uaic.ro/muzee/mineralogie/
Concept & 3D-modelling by Andrei Ionut APOPEI
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