Tetragonal Trapezohedral Class

Tetragonal Trapezohedral Class
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Tetragonal Trapezohedral Class

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Axial Configuration Paper Model

Tetragonal - Trapezohedral Class (4 2 2)  Mineral Species Listing

System Class Name

AXES

 Planes Center
Hermann-
Maugin
Symbols
2-Fold 3-Fold 4-Fold 6-Fold
Tetragonal Trapezohedral 4 - 1 - - - 422

Synonyms: Nickel Sulphate Type, Trapezohedral Hemihedra, or Tetragonal Holoaxial Class.

Space Groups in class: I4122, I422, P41212, P4122, P4212, P422, P42212, P4222, P43212, and P4322.

Example of the Tetragonal Trapezohedral class symmetry in stereo using JCrystal Applet by Steffen Weber.

Java Applet Not Started
Example of the Tetragonal trapezohedral class symmetry in stereo using Faces (version 3.5) by Georges Favreau.
Tetragonal 422.gif
Paper Model of the Tetragonal trapezohedral class. Click on image to view or print the PDF file. Go to Help file for more Information.

 
23 Minerals From the H-M Class Tetragonal - Trapezohedral (4 2 2)
Mineral Space Grp a c Z Vol (Ang3) Calc Dens
Cristobalite P 41212 4.9710 6.9180 4 171.0 2.33
Cyrilovite P 412121P 432121 7.3340 19.3680 4 1041.8 3.09
Ekanite I 422 7.4830 14.8930 2 833.9 3.41
Formicaite P 41212 6.7700 9.4630 4 433.7 1.99
Genkinite P 41212 7.7360 24.1610 8 1445.9 9.71
Kamphaugite-(Y) P 41212 7.4340 21.7930 4 1204.4 3.23
Lemanskiite P 4122 or P 4322 9.9758 36.7140 8 3653.7 3.86
Lipscombite P 41212 7.3100 13.2120 4 706.0 3.68
Mahnertite I 4mmm 10.0371 23.7390 8 2391.6 3.14
Maucherite P 41212P 43212 6.8680 21.8000 4 1028.3 8.04
Mellite P 4122P 4322 21.9100 23.2000 16 11137.1 1.27
Millisite P 41212P 43212 7.0000 19.0700 2 934.4 2.90
Paratellurite P 41212P 43212 4.8100 7.6130 4 176.1 6.02
Pottsite I 4122 11.0840 12.6340 10 1552.2 7.31
Retgersite P 41212P 43212 6.7820 18.2800 4 840.8 2.08
Saryarkite-(Y) P 4212P 42212 8.2130 6.5500 1 441.8 3.48
Sweetite P 41212P 43212 8.2220 14.3400 20 969.4 3.41
Ungavaite P 41212 P 4122 P 43212 7.7388 24.1450 8 1446.0 7.26
Uytenbogaardtite P 4122 9.7500 9.8500 8 936.4 8.29
Vinciennite P 4122 10.6970 10.6970 2 1224.0 4.31
Wardite P 41212 7.0587 19.0620 4 949.8 2.78
Zdenekite P 4122P 4322 10.0660 39.3900 8 3991.2 4.09
Zinclipscombite P 43212 or P 41212 7.2420 13.1250 4 688.4 3.72

(* - Mineral Name is Not IMA Approved)
(! - New Dana Classification Number Has Been Changed or Added)
(? - IMA Discredited Mineral Species Name
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