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Tetradymite

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Formula:
Bi
 
2
Te
 
2
S
System:TrigonalColour:Bright steel-gray, ...
Hardness:1½ - 2
Member of:Tetradymite Group
Name:From Greek "tetra", four, and a contraction of "didymos", twin, alluding to its usual occurrence as fourling twins.

Classification of Tetradymite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/D.09-60
Nickel-Strunz 10th (pending) edition ID:2.DC.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
D : Metal Sulfides, M: S = 3 :4 and 2:3
C : Variable M:S
Dana 8th edition ID:2.11.7.1

2 : SULFIDES
11 : AmBnXp, with (m+n):p = 2:3
Hey's CIM Ref.:3.7.29

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
7 : Sulphides etc. of V, As, Sb and Bi
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Type Occurrence of Tetradymite

Type Locality:Župkov, Žarnovica Co., Banská Bystrica Region, Slovakia
Year of Discovery:1831

Physical Properties of Tetradymite

Lustre:Metallic, Dull
Diaphaneity (Transparency):Opaque
Colour:Bright steel-gray, tin-white, tarnishes iridescent to dull
Streak:Pale steel-gray
Hardness (Mohs):1½ - 2

Crystallography of Tetradymite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:R3m {R3 2/m}
Cell Parameters:a = 4.23Å, c = 29.58Å
Ratio:a:c = 1 : 6.993
Unit Cell Volume:V 458.36 ų (Calculated from Unit Cell)
Crystal Atlas:
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Tetradymite - {012}, {001}, {101}

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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X-Ray Powder Diffraction:
d-spacingIntensity
3.10 (100)
2.292 (100)
2.111 (75)
1.965 (75)
1.929 (75)
1.638 (75b)
1.348 (75)

Chemical Properties of Tetradymite

Formula:
Bi
 
2
Te
 
2
S
Simplified for copy/paste:Bi2Te2S
Essential elements:Bi, S, Te
All elements listed in formula:Bi, S, Te
Common Impurities:Se,Au,Cu,Pb

Relationship of Tetradymite to other Species

Member of:Tetradymite Group
Other Members of Group:

- +
Ingodite
Bi
 
2
TeS
Kawazulite
Bi
 
2
Te
 
2
Se
Skippenite
Bi
 
2
TeSe
 
2
Sulphotsumoite
Bi
 
3
Te
 
2
S
Telluronevskite
Bi
 
3
TeSe
 
2
Tsumoite
BiTe
Vihorlatite
Bi
 
24
Se
 
17
Te
 
4
Related Minerals - Nickel-Strunz Grouping):

- +
2.DC.05Hedleyite
Bi
 
7
Te
 
3
2.DC.05Ikunolite
Bi
 
4
(S,Se)
 
3
2.DC.05Ingodite
Bi
 
2
TeS
2.DC.05Joséite-B
Bi
 
4
Te
 
2
S
2.DC.05Kawazulite
Bi
 
2
Te
 
2
Se
2.DC.05Laitakarite
Bi
 
4
Se
 
2
S
2.DC.05Nevskite
Bi(Se,S)
2.DC.05Paraguanajuatite
Bi
 
2
(Se,S)
 
3
2.DC.05Pilsenite
Bi
 
4
Te
 
3
2.DC.05Skippenite
Bi
 
2
TeSe
 
2
2.DC.05Sulphotsumoite
Bi
 
3
Te
 
2
S
2.DC.05Tellurantimony
Sb
 
2
Te
 
3
2.DC.05Tellurobismuthite
Bi
 
2
Te
 
3
2.DC.05Tsumoite
BiTe
2.DC.05Baksanite
Bi
 
6
Te
 
2
S
 
3
2.DC.05Joséite-C
Bi
 
16
Te
 
3
S
 
9
2.DC.05Protojoséite
Bi
 
4
TeS
 
2
2.DC.05Sztrókayite
Bi
 
3
TeS
 
2
2.DC.05Vihorlatite
Bi
 
24
Se
 
17
Te
 
4
2.DC.05Telluronevskite
Bi
 
3
TeSe
 
2
2.DC.05UM1983-09-S:BiPbTe
PbBi
 
3
S
 
2
Te
Related Minerals - Hey's Index Grouping:

- +
3.7.1Patrónite
VS
 
4
3.7.2Duranusite
As
 
4
S
3.7.3Dimorphite
As
 
4
S
 
3
3.7.4Realgar
As
 
4
S
 
4
3.7.5Pararealgar
As
 
4
S
 
4
3.7.6Alacránite
As
 
8
S
 
9
3.7.7Uzonite
As
 
4
S
 
5
3.7.8Orpiment
As
 
2
S
 
3
3.7.9Jeromite
3.7.10Laphamite
As
 
2
(Se,S)
 
3
3.7.11Getchellite
AsSbS
 
3
3.7.12Wakabayashilite
[(As,Sb)
 
6
S
 
9
][As
 
4
S
 
5
]
3.7.13Pääkkönenite
Sb
 
2
AsS
 
2
3.7.14Stibnite
Sb
 
2
S
 
3
3.7.15Metastibnite
Sb
 
2
S
 
3
3.7.16Tellurantimony
Sb
 
2
Te
 
3
3.7.17Bismuthinite
Bi
 
2
S
 
3
3.7.18Nevskite
Bi(Se,S)
3.7.19Guanajuatite
Bi
 
2
(Se,S)
 
3
3.7.21Ikunolite
Bi
 
4
(S,Se)
 
3
3.7.22Laitakarite
Bi
 
4
Se
 
2
S
3.7.23Poubaite
PbBi
 
2
(Se,Te,S)
 
4
3.7.24Tellurobismuthite
Bi
 
2
Te
 
3
3.7.25Součekite
PbCuBi(S,Se)
 
3
3.7.26Tsumoite
BiTe
3.7.27Pilsenite
Bi
 
4
Te
 
3
3.7.28Hedleyite
Bi
 
7
Te
 
3
3.7.30Joséite
Bi
 
4
TeS
 
2
3.7.31Joséite-B
Bi
 
4
Te
 
2
S
3.7.32Ingodite
Bi
 
2
TeS
3.7.33Sulphotsumoite
Bi
 
3
Te
 
2
S
3.7.34Kawazulite
Bi
 
2
Te
 
2
Se
3.7.36Skippenite
Bi
 
2
TeSe
 
2
3.7.37Kochkarite
PbBi
 
4
Te
 
7
3.7.38Rucklidgeite
(Bi,Pb)
 
3
Te
 
4
3.7.39Aleksite
PbBi
 
2
Te
 
2
S
 
2
3.7.40Junoite
Cu
 
2
Pb
 
3
Bi
 
8
(S,Se)
 
16

Other Names for Tetradymite

Synonyms:
Xaphyllite
Other Languages:
German:Tetradymit
Xaphyllit
Russian:Тетрадимит
Simplified Chinese:辉碲铋矿
Spanish:Tetradymita
Xaphyllita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Tetradymite

Reference List:

- +
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 161-164.

Glatz, A.C. (1967): The Bi2Te3–Bi2S3 system and the synthesis of the mineral tetradymite. American Mineralogist, 52, 161–170.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1981): 110: 596.

Cook, N.J., Ciobanu, C., Wagner, T., Stanley, C.J. (2007): Minerals of the system Bi-Te-Se-S related to the tetradymite archetype: Review of classification and compositional variation. Can. Mineral., 45, 665-708.

Mindat.org articles about Tetradymite

Article entries:
DiscoveryTibor Horváth

Internet Links for Tetradymite

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