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Tetradymite

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Formula:
Bi2Te2S
System:
Trigonal
Colour:
Bright steel-gray, ...
Hardness:
1½ - 2
Name:
From Greek "tetra", four, and a contraction of "didymos", twin, alluding to its usual occurrence as fourling twins.

Classification of Tetradymite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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First Recorded Occurrence of Tetradymite

Year of Discovery:
1831

Physical Properties of Tetradymite

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
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)

Crystallographic forms of Tetradymite

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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Transparency
Opaque | Translucent | Transparent

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray 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)

Chemical Properties of Tetradymite

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

Relationship of Tetradymite to other Species

Other Members of Group:
IngoditeBi2TeS
KawazuliteBi2Te2Se
SkippeniteBi2TeSe2
SulphotsumoiteBi3Te2S
TelluronevskiteBi3TeSe2
TsumoiteBiTe
VihorlatiteBi24Se17Te4
Group Members:
Joséite Bi4TeS2
2.DC.05HedleyiteBi7Te3
2.DC.05IkunoliteBi4(S,Se)3
2.DC.05IngoditeBi2TeS
2.DC.05Joséite-BBi4Te2S
2.DC.05KawazuliteBi2Te2Se
2.DC.05LaitakariteBi4Se2S
2.DC.05NevskiteBi(Se,S)
2.DC.05ParaguanajuatiteBi2Se3
2.DC.05PilseniteBi4Te3
2.DC.05SkippeniteBi2TeSe2
2.DC.05SulphotsumoiteBi3Te2S
2.DC.05TellurantimonySb2Te3
2.DC.05TellurobismuthiteBi2Te3
2.DC.05TsumoiteBiTe
2.DC.05BaksaniteBi6Te2S3
2.DC.05Joséite-CBi16Te3S9
2.DC.05ProtojoséiteBi4TeS2
2.DC.05SztrókayiteBi3TeS2
2.DC.05VihorlatiteBi24Se17Te4
2.DC.05TelluronevskiteBi3TeSe2
2.DC.05UM1983-09-S:BiPbTePbBi3S2Te
3.7.1PatróniteVS4
3.7.2DuranusiteAs4S
3.7.3DimorphiteAs4S3
3.7.4RealgarAs4S4
3.7.5PararealgarAs4S4
3.7.6AlacrániteAs8S9
3.7.7UzoniteAs4S5
3.7.8OrpimentAs2S3
3.7.9Jeromite
3.7.10LaphamiteAs2(Se,S)3
3.7.11GetchelliteAsSbS3
3.7.12Wakabayashilite[(As,Sb)6S9][As4S5]
3.7.13PääkköneniteSb2AsS2
3.7.14StibniteSb2S3
3.7.15MetastibniteSb2S3
3.7.16TellurantimonySb2Te3
3.7.17BismuthiniteBi2S3
3.7.18NevskiteBi(Se,S)
3.7.19GuanajuatiteBi2Se3
3.7.21IkunoliteBi4(S,Se)3
3.7.22LaitakariteBi4Se2S
3.7.23PoubaitePbBi2(Se,Te,S)4
3.7.24TellurobismuthiteBi2Te3
3.7.25SoučekitePbCuBi(S,Se)3
3.7.26TsumoiteBiTe
3.7.27PilseniteBi4Te3
3.7.28HedleyiteBi7Te3
3.7.30JoséiteBi4TeS2
3.7.31Joséite-BBi4Te2S
3.7.32IngoditeBi2TeS
3.7.33SulphotsumoiteBi3Te2S
3.7.34KawazuliteBi2Te2Se
3.7.36SkippeniteBi2TeSe2
3.7.37KochkaritePbBi4Te7
3.7.38Rucklidgeite(Bi,Pb)3Te4
3.7.39AleksitePbBi2Te2S2
3.7.40JunoiteCu2Pb3Bi8(S,Se)16

Other Names for Tetradymite

Name in Other Languages:

Other Information

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 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.

Internet Links for Tetradymite

Specimens:
The following Tetradymite specimens are currently listed for sale on minfind.com.

Localities for Tetradymite

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.
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