Trigonal
| Axial Configuration | Paper Model |
|---|---|
 |  |
Partial listing of all valid minerals that crystallize in the Trigonal System. There is not enough known about them to permit assignment into a class.
| System | Class Name |
AXES
| Planes | Center |
| |||
| 2-Fold | 3-Fold | 4-Fold | 6-Fold | |||||
| Trigonal | Pyramidal | - | 1 | - | - | - | - | 3 |
| Rhombohedral | - | 1 | - | - | - | yes | -3 | |
| Ditrigonal Pyramidal | - | 1 | - | - | 3 | - | 3m | |
| Trapezohedral | 3 | 1 | - | - | - | - | 32 | |
| Hexagonal Scalenohedral | 3 | 1 | - | - | 3 | yes | 3 2/m | |
| Mineral | Space Grp | a | c | Z | Vol (Ang3) | Calc Dens |
| Alunite | R 3m R 3m | 6.9700 | 17.3800 | 4 | 731.2 | 3.76 |
| Babkinite | P 3P 3m | 4.1910 | 39.6000 | 3 | 602.4 | 8.07 |
| Cesarolite | HEX-R | 2.8110 | 20.3860 | 1 | 139.5 | 5.98 |
| Coombsite | R 3 or R 3 | 11.8280 | 29.1460 | 3 | 3531.3 | 3.00 |
| Cronusite | Rm R 3m or R 32 | 3.3260 | 33.2900 | 3 | 318.9 | 2.53 |
| Daqingshanite-(Ce) | R 3m R 3m or R 32 | 10.0580 | 9.2250 | 4 | 808.2 | 4.52 |
| Desautelsite | R 3m or R 3m | 6.2300 | 46.7800 | 3 | 1572.4 | 2.09 |
| Droninoite | R 3m R 3m or R 32 | 6.2060 | 46.1840 | 6 | 1540.4 | 2.86 |
| Ernienickelite | R 3 or R 3 | 7.5140 | 20.5200 | 6 | 1003.4 | 3.87 |
| Francoanellite | R 3c or R 3c | 8.7100 | 82.5000 | 6 | 5420.3 | 2.28 |
| Geerite | R 3m R 3m or R 32 | 3.8300 | 46.8400 | 3 | 595.0 | 5.60 |
| Glaucocerinite | Unk (HEX-R) | 3.0570 | 32.5200 | 263.2 | 2.32 | |
| Jianshuiite | R 3 or R 3 | 7.5400 | 20.8200 | 6 | 1025.1 | 3.57 |
| Karchevskyite | P 3 P 31m P 31m P 312 | 16.0550 | 25.6600 | 3 | 5728.1 | 2.18 |
| Magnesionigerite-6N6S | Unk | 5.6920 | 13.7800 | 1 | 386.6 | 4.14 |
| Marinellite | P 31c or P 2c | 12.8800 | 31.7610 | 1 | 4563.1 | 2.43 |
| Mathewrogersite | R 3R 3-R 32R 3mR 3m- | 8.4570 | 45.9700 | 3 | 2847.3 | 4.69 |
| Melanocerite-(Ce) | Unk (HEX-R) | 9.3500 | 6.8800 | 2 | 520.9 | 5.76 |
| Muskoxite | Unk (pseudo HEX-R) | 3.0700 | 4.6000 | 37.6 | 3.46 | |
| Nanlingite | R 3m R 3m | 10.2400 | 25.7600 | 12 | 2339.3 | 3.91 |
| Orlymanite | P 3-P 3 | 9.6000 | 35.9200 | 5 | 2866.9 | 2.92 |
| Philipsbornite | R 3m-R 3m | 7.1100 | 17.0500 | 3 | 746.4 | 4.46 |
| Romanite | Trig ? | |||||
| Stepanovite | Unk | 9.8400 | 36.6700 | 6 | 3074.9 | 1.69 |
| Sztrokayite | Trig ? | |||||
| Tegengrenite | R 3 or R 3- | 16.1960 | 14.9480 | 42 | 3395.7 | 4.50 |
| Truscottite | p3 or p3 | 9.7310 | 18.8360 | 1 | 1544.7 | 2.54 |
| Vanoxite | Unk | |||||
| Zhemchuzhnikovite | Unk | 16.6700 | 12.5100 | 6 | 3010.6 | 1.63 |
| Zirklerite | Unk |
(* - Mineral Name is Not IMA Approved)
(! - New Dana Classification Number Has Been Changed or Added)
(? - IMA Discredited Mineral Species Name
(! - New Dana Classification Number Has Been Changed or Added)
(? - IMA Discredited Mineral Species Name
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