Trigonal Trapezohedral Class

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Trigonal Trapezohedral Class

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Axial Configuration	Paper Model

Trigonal - Trapezohedral Class (3 2) Mineral Species Listing

System Class Name

AXES

Planes Center

Hermann-
Maugin
Symbols

2-Fold 3-Fold 4-Fold 6-Fold

Trigonal Trapezohedral 3 1 - - - - 32

Synonyms: alpha-Quartz Type, Trapezohedral Tetartohedral, or Trigonal Holoaxial Class.

Space Groups in class: P3₁12, P312, P3₁21, P321, P3₂12, P3₂21, and R3₂.

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

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Example of the Trigonal - trapezohedral class symmetry in stereo using Faces (version 3.5) by Georges Favreau.

[画像:Trigonal 32.gif (3174 bytes)]

36 Minerals From the H-M Class Trigonal - Trapezohedral (3 2)

Mineral Space Grp a c Z Vol (Ang3) Calc Dens

Abhurite R 32 10.0180 44.0300 21 3826.9 4.35

Alarsite P 3₁21P 3₂21 5.0310 11.2260 3 246.1 3.36

Antarcticite P 3₂1 7.8900 3.9500 1 213.0 1.71

Berlinite P 3₁21P 3₂21 4.9200 10.9100 3 228.7 2.66

Calciohilairite R 32 20.8700 16.0020 24 6036.0 2.73

Caresite P 3₁12 or P 3₂12 10.8050 22.4800 6 2272.9 2.61

Charmarite-3T P 3₁12 10.9885 22.6300 6 2366.4 2.49

Cinnabar P 3₁21P 3₂21 4.1490 9.4950 3 141.6 8.19

Combeite P 3₂21P 3₁21 10.4800 13.1880 6 1254.4 2.81

Franzinite P 3₂1 12.9100 26.5430 1 3831.2 2.52

Godovikovite P 3₂1 4.7500 8.3000 1 162.2 2.50

Heazlewoodite R 32 5.7410 7.1390 3 203.8 5.87

Huntite R 32 9.5027 7.8212 3 611.6 2.88

Ingersonite P 3₁21 7.2820 17.6040 3 808.4 5.44

Joelbruggerite P 3₂1 8.4803 5.2334 1 325.9 6.70

Komkovite R 32 10.5260 15.7360 6 1509.9 3.37

Malladrite P 3₂1 8.8660 5.0430 3 343.3 2.73

Manganarsite P 3₁2 ? 11.4510 7.2520 4 823.5 3.60

Monohydrocalcite P 3₁12 10.5660 7.5730 9 732.2 2.41

Norsethite R 32 5.0200 16.7500 3 365.6 3.84

Olekminskite P 3₂1 8.6600 6.0800 3 394.9 3.61

Paralstonite P 3₂1 8.6920 6.1480 3 402.3 3.68

Pseudorutile P 3₂2 14.3750 4.6150 5 825.9 4.01

Pyatenkoite-(Y) R 32 10.6960 15.7280 3 1558.3 2.63

Quartz P 3₁21P 3₂21 4.9133 5.4053 3 113.0 2.65

Quintinite-3T P 3₁12P 3₂12 10.5710 22.7100 6 2197.8 2.21

Rodolicoite R 3121 5.0480 11.2150 3 247.5 3.04

Sabieite P 3₂1 4.8220 8.1696 1 164.5 2.68

Sazykinaite-(Y) R 32 10.8250 15.8090 3 1604.3 2.67

Schuetteite P 3₁21 7.0700 10.0500 3 435.1 8.36

Selenium P 3₁21P 3₂21 4.3660 4.9540 3 81.8 4.81

Sergeevite R 32 19.0100 7.8200 3 2447.4 2.66

Tellurium P 3₁21 4.4470 5.9150 3 101.3 6.27

Tincalconite R 32 11.1402 21.2070 3 2279.3 1.87

Ximengite P 3₁21 6.9860 6.4753 3 273.7 5.53

Zirconolite-3T P 3₁2 7.2870 16.8860 7 776.5 5.08

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

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