Tetragonal

Axial Configuration	Paper Model

Partial listing of all valid minerals that crystallize in the Tetragonal System. There is not enough known about them to permit assignment into a class.

System	Class Name	AXES				Planes	Center	Hermann- Maugin Symbols
		2-Fold	3-Fold	4-Fold	6-Fold
Tetragonal	Disphenoidal	1	-	-	-	-	-	-4
	Pyramidal	-	-	1	-	-	-	4
	Dipyramidal	-	-	1	-	1	yes	4/m
	Scalenohedral	3	-	-	-	2	-	4 2m
	Ditetragonal pyramidal	-	-	-	-	4	-	4mm
	Trapezohedral	4	-	1	-	-	-	422
	Ditetragonal-Dipyramidal	4	-	1	-	5	yes	4/m 2/m 2/m

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22 Minerals From the H-M Class Tetragonal - Unknown or Uncertain

Mineral	Space Grp	a	c	Z	Vol (Ang3)	Calc Dens
Benleonardite	Tetra	6.6030	12.7260	2	554.9	7.86
Cesplumtantite	Unk	13.5520	6.4450	2	1183.7	6.96
Chadwickite	Unk	11.0000	15.9600	14	1931.2	4.74
Chrombismite	I 4I 4-I 4/m	8.6490	17.2400	2	1289.6	9.86
Cuprotungstite	Unk	8.9300	14.4800	7	1154.7	7.25
Ecdemite	Unk	10.8000	25.6200	8	2988.3	7.32
Grechishchevite	P 42m-P 4m2P 4mmP 4/mmm	13.2250	8.6850	8	1519.0	7.15
Kamaishilite	I-lattice	8.8500	8.7700	4	686.9	2.83
Koninckite	Unk	11.9500	14.5200	16	2073.5	2.62
Lannonite	Unk	6.8400	28.0100	1	1310.5	2.32
Mongolite	Unk	7.0000	29.0100	2	1421.5	3.51
Oulankaite	Unk	9.0440	4.9370	2	403.8	10.92
Pintadoite	Tetra ?
Przhevalskite	Unk	7.2400	18.2200	2	955.1	3.51
Radhakrishnaite	Unk	5.7100	3.7700	1	122.9	8.88
Sincosite	P mmm or P 4/nmm	8.8950	12.7270	4	1007.0	2.99
Sinjarite	Unk.	7.2100	5.8600	2	304.6	1.60
Sphaerobismoite	P 42212 or P 41/n	8.0800	6.4600	4	421.8	7.09
Volfsonite	P 42m-P 4212	10.7800	5.3900	1	626.4	4.60
Woodruffite	Unk	8.4200	9.2800	2	657.9	3.37
Yecoraite	Unk
Zapatalite	Unk	15.2200	11.5200	6	2668.6	3.02

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