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Tetradymite

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Formula:
Bi2Te2S
Colour:
Bright steel-gray, tin-white, tarnishes iridescent to dull
Lustre:
Metallic, Dull
Hardness:
1½ - 2
Crystal System:
Trigonal
Name:
From Greek "tetra", four, and a contraction of "didymos", twin, alluding to its usual occurrence as fourling twins.
Tetradymite Group. One of many Bi-Te-S phases known.


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Classification of TetradymiteHide

Approved, 'Grandfathered' (first described prior to 1959)
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
2.11.7.1

2 : SULFIDES
11 : AmBnXp, with (m+n):p = 2:3
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

Physical Properties of TetradymiteHide

Metallic, Dull
Transparency:
Opaque
Colour:
Bright steel-gray, tin-white, tarnishes iridescent to dull
Streak:
Pale steel-gray
Hardness:
1½ - 2 on Mohs scale

Chemical Properties of TetradymiteHide

Formula:
Bi2Te2S
Common Impurities:
Se,Au,Cu,Pb

Crystallography of TetradymiteHide

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

Crystallographic forms of TetradymiteHide

Crystal Atlas:
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Tetradymite - {012}, {001}, {101}
3d models and HTML5 code kindly provided by www.smorf.nl.

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Opaque | Translucent | Transparent

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X-Ray Powder DiffractionHide

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

Type Occurrence of TetradymiteHide

Synonyms of TetradymiteHide

Other Language Names for TetradymiteHide

Relationship of Tetradymite to other SpeciesHide

Other Members of this group:
IngoditeBi2TeSTrig.
KawazuliteBi2Te2SeTrig.
SkippeniteBi2TeSe2Trig.
SulphotsumoiteBi3Te2STrig.
TelluronevskiteBi3TeSe2Trig.
TsumoiteBiTeTrig. 3m (3 2/m) : P3 1m
VihorlatiteBi24Se17Te4Trig.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Gold18 photos of Tetradymite associated with Gold on mindat.org.
Quartz8 photos of Tetradymite associated with Quartz on mindat.org.
Yecoraite4 photos of Tetradymite associated with Yecoraite on mindat.org.
Bismuthinite4 photos of Tetradymite associated with Bismuthinite on mindat.org.
Cosalite3 photos of Tetradymite associated with Cosalite on mindat.org.
Tellurobismuthite2 photos of Tetradymite associated with Tellurobismuthite on mindat.org.
Tsumoite2 photos of Tetradymite associated with Tsumoite on mindat.org.
Montanite2 photos of Tetradymite associated with Montanite on mindat.org.
Galena1 photo of Tetradymite associated with Galena on mindat.org.
Calcite1 photo of Tetradymite associated with Calcite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.DC.05HedleyiteBi7Te3Trig. 3m (3 2/m) : R3m
2.DC.05IkunoliteBi4(S,Se)3Trig.
2.DC.05IngoditeBi2TeSTrig.
2.DC.05Joséite-BBi4Te2STrig.
2.DC.05KawazuliteBi2Te2SeTrig.
2.DC.05LaitakariteBi4Se2STrig. 3m : R3m
2.DC.05NevskiteBi(Se,S)Trig.
2.DC.05ParaguanajuatiteBi2Se3Trig.
2.DC.05PilseniteBi4Te3Trig. 3m (3 2/m) : R3m
2.DC.05SkippeniteBi2TeSe2Trig.
2.DC.05SulphotsumoiteBi3Te2STrig.
2.DC.05TellurantimonySb2Te3Trig.
2.DC.05TellurobismuthiteBi2Te3Trig.
2.DC.05TsumoiteBiTeTrig. 3m (3 2/m) : P3 1m
2.DC.05BaksaniteBi6Te2S3Trig. 3m (3 2/m) : P3m1
2.DC.05Joséite-CBi16Te3S9
2.DC.05ProtojoséiteBi3(Te,S)2Trig.
2.DC.05SztrókayiteBi3TeS2
2.DC.05VihorlatiteBi24Se17Te4Trig.
2.DC.05TelluronevskiteBi3TeSe2Trig.
2.DC.05UM1983-09-S:BiPbTePbBi3S2Te

Related Minerals - Dana Grouping (8th Ed.)Hide

2.11.7.2TellurobismuthiteBi2Te3Trig.
2.11.7.3TellurantimonySb2Te3Trig.
2.11.7.4ParaguanajuatiteBi2Se3Trig.
2.11.7.5KawazuliteBi2Te2SeTrig.
2.11.7.6SkippeniteBi2TeSe2Trig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.7.1PatróniteVS4Mon.
3.7.2DuranusiteAs4SOrth. mmm (2/m 2/m 2/m) : Pmna
3.7.3DimorphiteAs4S3Orth. mmm (2/m 2/m 2/m) : Pnma
3.7.4RealgarAs4S4Mon. 2/m
3.7.5PararealgarAs4S4Mon. 2/m : P21/b
3.7.6AlacrániteAs8S9Mon. 2/m : P2/b
3.7.7UzoniteAs4S5Mon.
3.7.8OrpimentAs2S3Mon. 2/m
3.7.9JeromiteAmor.
3.7.10LaphamiteAs2(Se,S)3Mon. 2/m
3.7.11GetchelliteAsSbS3Mon. 2/m : P21/b
3.7.12Wakabayashilite[(As,Sb)6S9][As4S5]Orth. mm2 : Pna21
3.7.13PääkköneniteSb2AsS2Mon. 2/m : B2/m
3.7.14StibniteSb2S3Orth. mmm (2/m 2/m 2/m)
3.7.15MetastibniteSb2S3Amor.
3.7.16TellurantimonySb2Te3Trig.
3.7.17BismuthiniteBi2S3Orth. mmm (2/m 2/m 2/m)
3.7.18NevskiteBi(Se,S)Trig.
3.7.19GuanajuatiteBi2Se3Orth. mmm (2/m 2/m 2/m) : Pnma
3.7.21IkunoliteBi4(S,Se)3Trig.
3.7.22LaitakariteBi4Se2STrig. 3m : R3m
3.7.23PoubaitePbBi2(Se,Te,S)4Trig.
3.7.24TellurobismuthiteBi2Te3Trig.
3.7.25SoučekitePbCuBi(S,Se)3Orth.
3.7.26TsumoiteBiTeTrig. 3m (3 2/m) : P3 1m
3.7.27PilseniteBi4Te3Trig. 3m (3 2/m) : R3m
3.7.28HedleyiteBi7Te3Trig. 3m (3 2/m) : R3m
3.7.30JoséiteBi4TeS2Trig. 3m (3 2/m) : R3m
3.7.31Joséite-BBi4Te2STrig.
3.7.32IngoditeBi2TeSTrig.
3.7.33SulphotsumoiteBi3Te2STrig.
3.7.34KawazuliteBi2Te2SeTrig.
3.7.36SkippeniteBi2TeSe2Trig.
3.7.37KochkaritePbBi4Te7Trig.
3.7.38RucklidgeitePbBi2Te4Trig.
3.7.39AleksitePbBi2Te2S2Trig.
3.7.40JunoiteCu2Pb3Bi8(S,Se)16Mon. 2/m : B2/m

Other InformationHide

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

References for TetradymiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.

Internet Links for TetradymiteHide

Localities for TetradymiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

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