Crystal model made of cardboard
Model 857
Description
This crystal model is trigonal of class D3h.
In the collection are 45 crystal models made of cardboard by the company Dr. F. Krantz, Bonn. (Notation of Schoenfliess is used).
Additions
| System | Class | Model | | | System | Class | Model |
| Triclin | C1 | 861 | | | Rhombic | C2v | 739 |
| Ci=S2 | 854 | | | V | 734, 752 | ||
| Monoclin | Cs=C1h | 855 | | | Vh | 729, 742, 754 | |
| C2 | 727, 728, 743 | | | ||||
| C2h | 741, 753 | | | ||||
| Rhombohedral | C3 | 756 | | | Tetragonal | C4 | 853 |
| (trigonal) | C3i | 740 | | | C4h | 747 | |
| C3v | 722 | | | C4v | 744, 757 | ||
| D3 | 724, 733 | | | D4 | 730 | ||
| D3d | 723, 736, 738 | | | D4h | 748 | ||
| Trigonal | C3h | 856 | | | S4 | 859 | |
| D3h | 857 | | | Vd | 721 | ||
| Hexagonal | C6 | missing | | | Cubic | T | 726, 745 |
| C6h | 735 | | | Th | 725 | ||
| C6v | 746 | | | Td | 750, 751 | ||
| D6 | 755 | | | O | 731, 732 | ||
| D6h | 749 | | | Oh | 737, 758 |
Showcase of this model is Case number U 24
References
Separataband M4 im Mathematischen Institut, Katalog Dr. F. Krantz, Bonn p. 425.
Ewald. Handb. d. Physik, Bd. XXIV, p. 204.
Niggli. Geometrische Kristallographie, p. 132,133. Online version
Schoenflies, Arthur(1923). Theorie der Kristallstruktur.