Trigonal Pyramidal Class

(Translated by https://www.hiragana.jp/)
Trigonal Pyramidal Class

Trigonal Pyramidal Class

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Axial Configuration	Paper Model

Trigonal - Pyramidal Class (3) Mineral Species Listing

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

Synonyms: Trigonal Tetartohedral Hemimorphic Class, Sodium Periodate Type, or Trigonal Polar Class.

Space Groups in class: P3, P3₁, P3₂, and R3.

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

Java Applet Not Started

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

**40 Minerals From the H-M Class Trigonal - Pyramidal (3)**
Mineral	Space Grp	a	c	Z	Vol (Ang3)	Calc Dens
Aktashite	R 3	13.7200	9.3200	3	1519.3	5.47
Averievite	P 3	6.3750	8.3990	1	295.6	4.01
Bechererite	P 3	8.3220	7.3760	1	442.4	3.50
Belovite-(Ce)	P 3	9.6920	7.2010	2	585.8	4.23
Benstonite	R 3	18.2800	8.6700	3	2509.0	3.61
Biachellaite	P 3	12.9130	79.6050	16	11495.4	2.71
Bottinoite	P 3	16.0450	9.7840	6	2181.4	2.81
Brandholzite	P 3	16.1140	9.8630	6	2217.9	4.62
Cappelenite-(Y)	P 3	10.6700	4.6800	1	461.4	4.84
Carlinite	R 3	12.1200	18.1750	27	2312.1	8.55
Deloneite-(Ce)	P 3	9.5100	7.0100	2	549.1	3.84
Diversilite-(Ce)	R 32	10.7080	60.0730	6	5965.2	3.80
Dixenite	R 3	8.2330	37.4900	3	2200.7	4.36
Franciscanite-III	P 3	8.1480	4.8040	1	276.2	4.29
Franciscanite-VIII	P 3	8.1480	4.8040	2	276.2	3.99
Ganomalite	P 3	9.8200	10.1300	1	846.0	5.69
Gordaite	P 3	8.3630	13.0180	2	788.5	2.64
Gruzdevite	R 3	13.9000	9.4320	3	1578.2	5.85
Hematolite	R 3	8.2750	36.6000	3	2170.4	3.37
Holfertite	P 3	10.8240	7.5490	3	765.9	4.22
Ilimaussite-(Ce)	R 32	10.7700	61.0500	3	6132.7	3.45
IMA2009-001	R 3	9.1202	102.1450	3	7358.0	3.11
Jarosite	R 3	7.2100	17.0300	3	766.7	3.25
Kelyanite	P 3	13.5600	10.0040	3	1593.0	8.68
Kuzelite	R 3	5.7600	53.6600	3	1541.8	2.01
Nowackiite	R 3	13.4400	9.1700	3	1434.5	4.38
Oneillite	R 3	14.1920	29.9830	3	5229.9	2.98
Orebroite-III	P 3	8.1830	4.7560	1	275.8	4.55
Orebroite-VIII	P 3	8.1830	4.7560	2	275.8	4.61
Parisite-(Ce)	R 3	7.1248	14.0175	3	616.2	4.34
Parisite-(Nd)	R 3	7.1250	14.0180	3	616.3	4.49
Rontgenite-(Ce)	R 3	7.1300	69.4000	9	3055.4	4.19
Sheldrickite	P 3₂	6.7180	15.0500	3	588.2	2.86
Simpsonite	P 3	7.3770	4.5140	1	212.7	6.35
Stavelotite-(La)	P 3₁	11.5250	33.3470	3	3835.9	4.47
Stillwellite-(Ce)	P 3₁	6.8440	6.7000	3	271.8	4.51
Voronkovite	R 3	14.2050	30.2650	3	5288.8	2.94
Welinite-III	P 3	8.1550	4.7850	1	275.6	5.42
Welinite-VIII	P 3	8.1550	4.7850	2	275.6	4.85
Zussmanite	R 3	11.6500	28.6880	3	3372.0	3.17

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

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