Trigonal Ditrigonal Pyramidal Class

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Trigonal Ditrigonal Pyramidal Class

Trigonal Ditrigonal Pyramidal Class

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Axial Configuration	Paper Model

Trigonal - Ditrigonal Pyramidal Class (3 m) Mineral Species Listing

System	Class Name	AXES				Planes	Center	Hermann- Maugin Symbols
		2-Fold	3-Fold	4-Fold	6-Fold
Trigonal	Ditrigonal Pyramidal	-	1	-	-	3	-	3m

Synonyms: Rhombohedral-Hemimorphic Class, Tourmaline Type, Trigonal Hemihedral Hemimorphic. or Ditrigonal Polar Class.

Space Groups in class: P31c, P31m, P3c1, P3m1, R3c, and R3m.

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

Java Applet Not Started

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

**112 Minerals From the H-M Class Trigonal - Ditrigonal Pyramidal (3 m)**
Mineral	Space Grp	a	c	Z	Vol (Ang3)	Calc Dens
Acetamide	R 3c	11.4400	13.5000	18	1530.1	1.15
Aerinite	P 3c1	16.8720	5.2256	1	1288.3	2.51
Alloriite	P 3₁c	12.8920	21.3400	1	3071.6	2.36
Aluminocerite-(Ce)	R 3c	10.5810	37.9320	6	3677.8	4.67
Ammoniojarosite	R 3m	7.2000	17.0000	3	763.2	3.13
Aqualite	R 3m	14.0780	31.2400	3	5362.0	2.61
Argentojarosite	R 3m	7.3500	16.5800	3	775.7	3.66
Arsenocrandallite	R 3m	7.0800	17.2700	3	749.7	3.96
Arsenoflorencite-(La)	R 3m	7.0000	16.6800	3	707.8	3.97
Arsenoflorencite-(Nd)	R 3m	7.0300	16.5500	3	708.3	4.30
Asbecasite	P 3c	8.3600	15.3000	2	926.1	3.79
Beaverite	R 3m	7.2030	16.9400	3	761.2	4.33
Belendorffite	R 3m	13.3600	16.1610	12	2498.1	13.15
Bobdownsite	R 3c	10.3224	37.0700	6	3420.7	3.07
Buergerite	R 3m	15.8740	7.1960	3	1570.3	3.34
Buryatite	P 3₁c	11.1400	20.9900	4	2255.9	2.15
Bystrite	P 3₁c	12.8550	10.7000	2	1531.3	2.40
Carbokentbrooksite	R 3m	14.2390	30.0390	3	5274.4	2.95
Cerite-(Ce)	R 3c	10.7790	38.0610	6	3829.7	5.24
Cerite-(La)	R 3c	10.7493	38.3180	6	3834.4	4.74
Changbaiite	R 3m	10.4990	11.5530	9	1102.9	6.63
Charlesite	P 3₁c	11.1600	21.2100	2	2287.7	1.79
Chlorartinite	R 3c (?)	23.1630	7.2210	18	3355.2	1.92
Chromdravite	R 3m	16.1100	7.2700	3	1634.0	3.40
Chvilevaite	P 3m	3.8730	6.8480	1	89.0	3.92
Congolite	R 3c	8.6225	21.0540	6	1355.6	3.37
Corkite	R 3m	7.2200	16.6600	3	752.1	4.42
Cronstedtite	P 3₁m	5.4860	7.0950	1	184.9	3.59
Dravite	R 3m	15.9410	7.2010	3	1584.7	3.01
Dualite	R 3m	14.1530	60.7200	3	10533.2	2.82
Dukeite	P 3₁c	15.0670	15.2930	2	3006.6	7.18
Dussertite	R 3m	7.4244	17.4940	3	835.1	3.98
Elbaite	R 3m	15.8380	7.1030	3	1543.0	2.96
Ellisite	R 3m	12.3240	9.6470	7	1268.9	7.18
Feklichevite	R 3m	14.2550	30.1700	3	5309.3	2.85
Fencooperite	P 3m1	10.7270	7.0850	1	706.0	4.24
Ferrokentbrooksite	R 3m	14.2277	29.9870	3	5256.9	3.06
Ferromerrillite	R 3c	10.3720	37.2170	6	3467.4	3.15
Feruvite	R 3m	16.0120	7.2450	3	1608.7	3.24
Foitite	R 3m	15.9670	7.1260	3	1573.3	3.27
Galeite	P 3m	12.1970	13.9550	3	1797.9	2.60
Gallobeudantite	R 3m	7.2250	17.0300	3	769.9	4.65
Georgbarsanovite	R 3m	14.2740	30.0200	3	5297.0	3.10
Giuseppettite	P 3₁c	12.8560	42.2560	1	6048.3	2.38
Golyshevite	R 3m	14.2310	29.9840	3	5258.9	2.77
Gratonite	R 3m	17.7010	7.7920	3	2114.3	6.23
Grattarolaite	R 3m	7.9940	6.8550	4	379.4	5.44
Hatrurite	R 3m	7.1500	25.5600	9	1131.6	3.02
Holtedahlite	P 3₁m	11.2030	4.9770	1	541.0	2.93
Hundholmenite-(Y)	R 3m	10.6750	27.0200	3	2666.6	4.71
Hydrocerussite	P 3₁m	5.2400	23.7400	3	564.5	6.84
Hydroniumjarosite	R 3m	7.3559	17.0090	3	797.0	3.00
Hydroxyuvite	R 3m	15.9540	7.2140	3	1590.2	3.05
Ikranite	R 3m	14.1670	30.0810	3	5228.5	2.63
IMA2007-041T	R 3m	10.9400	13.9700		1448.0
IMA2008-029	R 3c	15.2171	8.9323		1791.3
Iquiqueite	P 3₁c	11.6369	30.1580	3	3536.8	2.06
Johnsenite-(Ce)	R 3m	14.2370	30.0300	3	5271.4	3.19
Kalsilite	P 3₁c	5.1570	8.7060	2	200.5	2.62
Kentbrooksite	R 3m	14.1680	30.0847	3	5229.9	3.72
Khomyakovite	R 3m	14.2959	30.0840	3	5324.6	3.13
Krivovichevite	R 3c	7.7420	32.0820	6	1665.3	5.22
Labyrinthite	R 3m	14.2390	60.7330	3	10663.9	2.85
Liddicoatite	R 3m	15.8750	7.1260	3	1555.3	2.94
Lusungite	R 3m	7.0400	16.8000	3	721.1	3.99
Magnesiofoitite	R 3m	15.8840	7.1780	3	1568.4	2.98
Makinenite	R 3m	10.0100	3.2800	9	284.6	7.23
Manganokhomyakovite	R 3m	14.2820	30.1200	3	5320.6	3.13
Matraite	R 3m	3.8000	9.4000	3	117.6	4.13
Merenskyite	P 3m1	3.9780	5.1250	1	70.2	9.14
Merrillite	R 3c	10.3620	37.1060	3	3450.3	3.10
Merrillite-(Ca)	R 3c	10.3620	37.1060	3	3450.3	3.03
Merrillite-(Y)	R 3c	10.3620	37.1060	3	3450.3	3.29
Mertieite-II	R 3c	7.6010	42.9040	12	2146.7	11.25
Mogovidite	R 3m	14.2320	30.2100	3	5299.2	2.88
Natrojarosite	R 3m	7.1800	16.3000	3	727.7	3.32
Nierite	P 3₁c	7.7400	5.6100	4	291.1	3.20
Okanoganite-(Y)	R 3m	10.7108	27.0398	3	2686.5	4.93
Olenite	R 3m	15.8020	7.0860	3	1532.3	3.13
Osarizawaite	R 3m	7.0500	17.2500	3	742.5	4.15
Perryite	R 3c	6.6400	37.9820	12	1450.3	7.56
Pezzottaite	R 3c	15.9460	27.8030	18	6122.5	3.22
Povondraite	R 3m	16.1860	7.4440	3	1689.0	3.41
Proshchenkoite-(Y)	R 3m	10.7527	27.4002	3	2743.6	4.92
Pyrargyrite	R 3c	11.0470	8.7190	6	921.5	5.86
Raslakite	R 3m	14.2290	30.0190	3	5263.5	2.63
Rastsvetaevite	R 3m	14.2490	60.9690	3	10720.3	2.82
Rossmanite	R 3m	15.7700	7.0850	3	1525.9	3.02
Satterlyite	P 3₁m	11.3550	5.0394	6	562.7	3.68
Schairerite	P 3₁m	12.1700	19.2900	3	2474.3	2.63
Schallerite	P 3m1 ?	13.4000	14.2800	2	2220.6	3.45
Schollhornite	R 3m ?	3.3200	26.6000	3	253.9	2.77
Schorl	R 3m	15.9900	7.1950	3	1593.2	3.29
Schorl-(F)	R 3m	15.9970	7.1790	3	1591.0	3.22
Selenopolybasite	P 3m1	7.5950	12.0731	1	603.1	6.55
Shafranovskite	P 3₁c	14.5190	21.0620	6	3845.1	2.72
Spangolite	P 3₁c	8.2540	14.3540	2	846.9	3.13
Spionkopite	P 3m1 ?	22.9620	41.4290	504	18917.1	5.35
Strontiowhitlockite	R 3c	10.6440	39.5400	6	3879.5	3.57
Sturmanite	P 3₁c	11.1600	21.7900	2	2350.3	1.79
Taseqite	R 3m	14.2860	29.9900	3	5300.6	3.20
Trembathite	R 3c	8.5740	20.9900	6	1336.3	3.10
Tuite	R 3m	5.2580	18.7270	3	448.4	3.41
Uvite	R 3m	15.9730	7.2310	3	1597.7	3.02
Vanadiumdravite	R 3m	16.1200	7.3900	3	1663.1	3.32
Vicanite-(Ce)	R 3m	10.7950	27.3360	3	2758.7	4.61
Whitlockite	R 3c	10.3300	37.1030	6	3428.8	3.11
Wickenburgite	P 3₁c	8.5550	20.1900	2	1279.7	3.89
Yarrowite	P 3m1 ?	3.8000	67.2600	3	841.1	4.91
Yushkinite	P 3m1	3.2100	11.3000	2	100.8	2.88
Zakharovite	P 3₁mP 3m1	14.5800	37.7100	9	6942.3	2.67
Zirsilite-(Ce)	R 3m	14.2480	30.0760	3	5287.6	3.12

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

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