File:Brockhaus chrystal shapes (Krystalle. I.); 18-20 (tetrahedral).jpg

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original German legendEnglish articles
18. Trigondodekaeder.Triakis tetrahedron
19. Deltoiddodekaeder.Rhombic (deltoidal) dodecahedron flattened to tetrahedral symmetry (category)
20. Hexakistetraeder.Disdyakis hexahedron flattened to tetrahedral symmetry (category)
Date between 1892 and 1920
date QS:P,+1500-00-00T00:00:00Z/6,P1319,+1892-00-00T00:00:00Z/9,P1326,+1920-00-00T00:00:00Z/9
Source Brockhaus Konversations-Lexikon, 14. Auflage
Author Unknown authorUnknown author

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