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Hexagonal Dihexagonal Dipyramidal Class

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Axial Configuration	Paper Model

Hexagonal - Dihexagonal Dipyramidal Class (6/m 2/m 2/m) Mineral Species Listing

System	Class Name	AXES				Planes	Center	Hermann- Maugin Symbols
		2-Fold	3-Fold	4-Fold	6-Fold
Hexagonal	Dihexagonal Dipyramidal	6	-	-	1	7	yes	6/m 2/m 2/m

Synonyms: Normal Class, Beryl Type, Holohedral, or Dihexagonal Equatorial Class.

Space Groups in class: P6/mcc, P6/mmm, P6₃/mcm, and P6₃/mmc

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

Java Applet Not Started

Example of the Hexagonal - dihexagonal dipyramidal class symmetry in stereo using Faces (version 3.5) by Georges Favreau.

**134 Minerals From the H-M Class Hexagonal - Dihexagonal Dipyramidal (6/m 2/m 2/m)**
Mineral	Space Grp	a	c	Z	Vol (Ang3)	Calc Dens
Achavalite	P 6₃/mmc	3.6360	5.9460	2	68.1	6.58
Akhtenskite	P 6₃/mmc	2.8500	4.4800	1	31.5	4.58
Algodonite	P 6₃/mmc	2.6000	4.2280		24.8	9.18
Allargentum	P 6₃/mmc	2.9450	4.7700	2	35.8	10.01
Almarudite	P 6/mcc	9.9970	14.0900	2	1219.5	2.72
Astrocyanite-(Ce)	P 6/mmm	14.9600	26.8600	12	5206.0	3.64
Atheneite	P 6/mmm	6.7980	3.4830	2	139.4	11.07
Barbertonite	P 6₃/mmc	6.1700	15.5200	1	511.7	2.12
Batiferrite	P 6₃/mmc	5.9080	23.3900	2	707.0	5.03
Bazzite	P 6/mcc	9.5210	9.1650	2	719.5	2.61
Bentorite	P 6₃/mmc	22.3500	21.4100	8	9262.0	1.85
Berezanskite	P 6/mcc	9.9030	14.2740	2	1212.3	2.66
Beryl	P 6/mmc	9.2150	9.1920	2	676.0	2.64
Brannockite	P 6/mcc	10.0020	14.2630	2	1235.7	2.99
Breithauptite	P 6₃/mmc	3.9300	5.1300	2	68.6	8.73
Brugnatellite	P 6₃/mmc	5.4800	16.0000	1	416.1	2.21
Burbankite	P 6₃/mmc	10.5300	6.4700	2	621.3	3.77
Burnsite	P 6₃/mmc	8.7805	15.5210	2	1036.3	3.85
Buttgenbachite	P 6₃/mmc	15.8200	9.1300	2	1978.9	3.45
Cacoxenite	P 6/mmm	27.5590	10.6550	3	7008.3	3.19
Cadmium	P 6₃/mmc	2.9790	5.6170	2	43.2	8.65
Catamarcaite	P 6₃mc	7.5238	12.3900	2	607.4	4.93
Chaoite	P 6/mmm	8.9480	14.0780	168	976.2	3.43
Chayesite	P 6/mcc	10.1530	14.3880	2	1284.5	2.69
Claringbullite	P 6₃/mmc	6.6733	9.1850	2	354.2	3.83
Cordylite-(Ce)	P 6₃/mmc	5.0930	23.0170	2	517.0	4.08
Covellite	P 6₃/mmc	3.7920	16.3440	6	203.5	4.68
Darapiosite	P 6/mcc	10.3200	14.3900	2	1327.2	2.82
Diaoyudaoite	P 6₃/mmc	5.6020	22.6260	2	614.9	3.20
Dmisteinbergite	P 6/mmm	5.1220	14.7810	2	335.8	2.75
Drysdallite	P 6₃/mmc	3.2860	12.8990	2	120.6	6.34
Dugganite	P 6/mmm	8.4720	5.2080	1	323.7	6.68
Dusmatovite	P 6/mcc	10.2180	14.2920	2	1292.3	3.02
Eifelite	P 6/mcc	10.1370	14.2230	2	1265.7	2.68
Erionite-Ca	P 6₃/mmc	13.3330	15.0910	1	2323.3	2.08
Erionite-K	P 6₃/mmc	13.2000	15.0750	1	2274.8	2.16
Erionite-Na	P 6₃/mmc	13.2100	15.0480	1	2274.1	2.05
Ettringite	P 6₃/mmc	22.4600	21.4400	8	9366.5	1.78
Fairchildite	P 6₃/mmc	5.2720	13.2800	2	319.7	2.48
Farneseite	P 6₃/m	12.8784	37.0078	1	5315.6	2.52
Fleischerite	P 6₃/mmc	8.8900	10.8600	2	743.3	4.50
Fluocerite-(Ce)	P 6₃/mcm	7.1200	7.2800	6	319.6	6.14
Freboldite	P 6₃/mmc	3.6100	5.2800	2	59.6	7.68
Friedrichbeckeite	P 6/mcc	9.9700	14.1300	2	1216.4	2.68
Gmelinite-Ca	P 6₃/mmc	13.8000	9.9640	1	1643.3	2.11
Gmelinite-K	P 6₃/mmc	13.6210	10.2540	1	1647.6	2.05
Gmelinite-Na	P 6₃/mmc	13.7560	10.0480	1	1646.6	2.02
Graphite	P 6₃/mmc	2.4640	6.7360	4	35.4	2.25
Haggertyite	P 6₃/mmc	5.9260	23.3200	2	709.2	4.87
Hauckite	P 6/mmm	9.1700	30.2100	1	2200.0	3.01
Hawthorneite	P 6₃/mmc	5.8710	23.0600	2	688.4	5.02
Heterogenite-2H	P 6₃/mmc	2.8550	8.8050	2	62.2	4.91
Hexaferrum	P 6₃/mmc	2.5910	4.1680	2	24.2	11.86
Hexamolybdenum	P 6₃/mmc	2.7506	4.4318	2	29.0	11.90
Hexatestibiopanickelite	P 6₃/mmc	3.9830	5.3390	2	73.4	8.91
Hibonite	P 6₃/mmc	5.5640	21.8920	2	586.9	4.01
Ice	P 6₃/mmc	4.5100	7.3500	4	129.5	0.92
Idaite	P 6₃/mmc	3.9000	16.9500	1	223.3	4.21
IMA2008-009	P 6₃/m	9.8450	7.3830	2	619.7	3.98
IMA2008-055	P 6₃/mmc	2.6941	4.2731	2	26.9	8.80
IMA2009-005	P 6₃/m	9.4437	6.8169	2	526.5	4.39
Imgreite	P 6₃/mmc	3.9370	5.3540	2	71.9	8.61
Indialite	P 6/mcc	9.8120	9.3510	2	779.7	2.49
Jaipurite	P 6₃/mmc	3.3670	5.1600	2	50.7	5.97
Kittatinnyite	P 6₃/mmc	6.4980	22.7800	2	833.0	2.63
Kleinite	C63/mmc	13.5600	11.1300	18	1772.3	8.01
Klochite	P 6/mcc	10.1200	14.2980	2	1268.1	3.11
Klockmannite	P 6₃/mmc	3.9380	17.2500	6	231.7	6.13
Kokchetavite	P 6/mmm(?)	5.2700	7.8200	1	188.1	2.46
Kotulskite	P 6₃/mmc	4.1900	5.6700	2	86.2	9.80
Koutekite	P 6₃/mmc	11.5100	14.5400	18	1668.2	8.38
Langisite	P 6₃/mmc	3.5380	5.1270	2	55.6	7.99
Lindqvistite	P 6₃/mmc	5.9510	33.3580	2	1023.1	5.73
Lonsdaleite	P 6₃/mmc	2.5200	4.1200	4	22.7	3.52
Luanheite	P 6₃/mmc	6.6100	10.9800	6	415.5	12.57
Lukechangite-(Ce)	P 6₃/mmc	5.0680	22.8700	2	508.7	3.97
Magnetoplumbite	P 6₃/mmc	5.8730	23.0070	2	687.2	5.71
Manasseite	P 6₃/mmc	6.1200	15.3240	1	497.1	2.02
Mavlyanovite	P 6₃/mcm	6.8971	4.8075	2	198.1	6.02
Mazzite-Mg	P 6₃/mmc	18.3920	7.6460	1	2239.9	2.08
Mazzite-Na	P 6₃/mmc	18.2343	7.6371	1	2199.1	2.18
Merrihueite	P 6/mcc	10.1600	14.3200	2	1280.2	2.92
Methane hydrate-H	P 6/mmm	12.2600	10.1700	1	1323.8	0.96
Milarite	P 6/mcc	10.4100	13.8450	1	1299.4	2.53
Molybdenite	P 6₃/mmc	3.1600	12.3000	2	106.4	5.00
Natrofairchildite	P 6₃/mmc	5.2910	13.2180	2	320.5	2.14
Nezilovite	P 6₃/mmc	5.8540	22.8820	2	679.1	5.84
Nickeline	P 6₃/mmc	3.6090	5.0190	2	56.6	7.84
Niggliite	P 6₃/mmc	4.1110	5.4460	2	79.7	13.07
Oftedalite	P 6/mmc	10.0970	13.9910	2	1235.3	2.62
Osmium	P 6₃/mmc	2.7140	4.3140	2	27.5	23.01
Osumilite-(Fe)	P 6/mcc	10.1550	14.2840	2	1275.7	2.73
Osumilite-(Mg)	P 6/mcc	10.1170	14.2550	2	1263.6	2.67
Penfieldite	P 6/mmm	11.2800	48.6500	36	5360.8	6.00
Perhamite	P 6/mmm	7.0200	20.2100	1	862.5	2.53
Perlialite	P 6/mmm	18.4900	7.5100	1	2223.5	2.26
Plumboferrite	P 6₃/mmc	5.9310	23.5510	2	717.5	6.08
Plumbopalladinite	P 6₃/mmc	4.4700	5.7190	1	99.0	12.31
Poudretteite	P 6/mcc	10.2390	13.4850	2	1224.3	2.48
Rhenium	P 6₃/mmc	2.7600	4.4580	2	29.4	21.03
Roedderite	P 6₃/mmc	10.1390	14.2750	2	1270.9	2.70
Rutheniridosmine	P 6₃/mmc	2.7100	4.3000	2	27.4	22.16
Ruthenium	P 6₃/mmc	2.7040	4.3260	2	27.4	16.65
Sacrofanite	P 6₃/mmc ?	12.8650	72.2400	14	10354.5	2.62
Schachnerite	P 6₃/mmc	2.9780	4.8420	1	37.2	13.36
Sederholmite	P 6₃/mmc	3.6500	5.3400	2	61.6	7.42
Shibkovite	P 6/mcc	10.5050	14.1850	2	1355.7	2.89
Sjogrenite	P 6₃/mmc	3.1130	15.6100		131.0	2.10
Sobolevskite	P 6₃/mmc	4.2300	5.6900	2	88.2	11.88
Sogdianite	P 6/mmm	10.0590	14.0520	2	1231.3	2.83
Sorosite	P 6₃/mmc	4.2170	5.1200	2	78.9	7.71
Stannopalladinite	P 6₃/mmc	4.4000	5.6600	1	94.9	9.18
Stoppaniite	P 6/mmc	9.3460	9.2130	1	696.9	2.84
Stumpflite	P 6₃/mmc	4.1750	5.5040	2	83.1	13.54
Stutzite	P 6/mmm	13.4900	8.4800	7	1336.4	7.74
Sudburyite	P 6₃/mmc	4.0600	5.5900	2	79.8	9.00
Sugilite	P 6/mcc	10.0090	14.0060	2	1215.1	2.85
Titanium	P 6₃/mmc	2.9500	4.6900	2	35.4	4.50
Trattnerite	P 6/mcc	10.0500	14.3380	2	1254.2	2.69
Troilite	P 6₃/mmc	3.4520	5.7620	2	59.5	4.91
Tungstenite	P 6₃/mmc	3.1540	12.3620	2	106.5	7.73
Vaterite	P 6₃/mmc	7.1350	16.9800	12	748.6	2.66
Vavrinite	P 6₃/mmc	3.9090	15.6820	2	207.5	7.86
Verplanckite	P 6/mmm	16.3980	7.2000	6	1676.7	3.48
Wallkilldellite	P 6/mmc	6.5060	23.4900	1	861.1	2.90
Weishanite	P 6₃/mmc	2.9265	4.8178		35.7	10.75
Weissite	P 6/mmm	8.4320	21.6900	24	1335.5	7.41
Xifengite	P 6₃/mcm	6.7590	4.7200	2	186.7	6.46
Yagiite	P 6/mmc	10.0900	14.2900	1	1259.9	2.62
Yimengite	P 6₃/mmc	5.8750	22.9400	2	685.7	4.06
Yuanjiangite	P 6₃/mmc	4.3160	5.5100	2	88.9	11.79
Zaccagnaite	P 6₃/mmc	3.0725	15.1135		123.6	2.82
Zenzenite	P 6₃/mcm	10.0080	13.6720	4	1185.9	6.84
Zinc	P 6₃/mmc	2.6591	4.9353	2	30.2	7.19

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

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