Hexagonal Trapezohedral Class

Hexagonal Trapezohedral Class
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Hexagonal Trapezohedral Class

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Axial Configuration Paper Model

Hexagonal - Trapezohedral Class (6 2 2)  Mineral Species Listing

System Class Name

AXES

 Planes Center
Hermann-
Maugin
Symbols
2-Fold 3-Fold 4-Fold 6-Fold
Hexagonal Trapezohedral 6 - - 1 - - 622

Synonyms: beta-Quartz Type, Trapezohedral Hemihedral, or Hexagonal Holoaxial Class.

Space Groups in class: P622, P6122,  P6222, P6322, P6422, P6522.

Example of the Hexagonal - trapezohedral class symmetry in stereo using JCrystal Applet by Steffen Weber.

Java Applet Not Started
Example of the Hexagonal - trapezohedral class symmetry in stereo using Faces (version 3.5) by Georges Favreau.
Hexagonal 622.gif (3363 bytes)
 
26 Minerals From the H-M Class Hexagonal - Trapezohedral (6 2 2)
Mineral Space Grp a c Z Vol (Ang3) Calc Dens
Brockite P 6222 6.9800 6.4000 3 270.0 4.07
Calciotantite P 6322 6.2300 12.2200 2 410.8 6.53
Charmarite-2H P 6322 10.9850 15.1000 4 1578.0 2.49
Edgarite P 6322 5.7710 12.1900 2 351.6 4.10
Faheyite P 6222 9.4300 16.0000 3 1232.2 2.69
Grayite P 6222 6.9570 6.3960 2 268.1 3.94
Iltisite P 62P 6222 8.2340 19.3800 12 1137.9 6.78
Kaliophilite P 6322 26.9300 8.5220 54 5352.4 2.65
Kraisslite P 6322 8.2200 43.8800 2 2567.7 3.91
Mallestigite P 63 8.9380 11.0980 2 767.8 4.91
Microsommite P 6322 22.0800 5.3300 3 2250.4 2.41
Molybdophyllite P 6322 9.3710 27.4400 2 2086.8 4.98
Palarstanide P 6322 6.7840 14.8000 4 589.9 12.86
Parakhinite P 6222 or P 6422 5.7530 17.9580 3 514.7 6.69
Penzhinite P 6322 13.7790 16.9800 18 2791.9 8.13
Quetzalcoatlite C6322 10.0970 4.9440 1 436.5 6.13
Quintinite-2H P 6322 10.5710 15.1710 4 1468.2 2.20
Rhabdophane-(Ce) P 6222 6.9600 6.3720 3 267.3 4.71
Rhabdophane-(La) P 6222 6.9800 6.3900 3 269.6 4.66
Rhabdophane-(Nd) P 6222 7.0500 6.4400 3 277.2 4.59
Santanaite P 6322 9.0300 39.8400 6 2813.4 9.16
Siderazot P 6322 4.6780 4.3690 1 82.8 3.08
Tounkite P 6222 12.8430 32.2390 6 4605.2 2.61
Tristramite P 6222 6.9130 6.4220 3 265.8 4.35
Virgilite P 6222P 6422 5.1320 5.4540 1 124.4 2.44
Vishnevite P 6322 12.6700 5.1500 1 716.0 2.42

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