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Semseyite

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Andor Semsey
Formula:
Pb9Sb8S21
System:
Monoclinic
Colour:
Steel-grey to black
Lustre:
Metallic
Hardness:
Name:
For Andor von Semsey (1833-1923), a Nobleman and amateur Hungarian mineralogist, whose first name gave rise to Andorite.
Plagionite Group

Semseyite belongs to a homologous series of lead antimony sulphides. The structure contains sheets of galena, the thickness of this sheet determines the position in the homologous series. Semseyite has the thickest sheet and fülöppite the thinnest.

Classification of Semseyite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
2.HC.10d

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
C : With only Pb
3.6.20.4

3 : SULFOSALTS
6 : 2 < ø < 2.49
5.6.13

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
6 : Sulpharsenites etc. of Pb alone
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Type Occurrence of Semseyite

Year of Discovery:
1881

Physical Properties of Semseyite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Steel-grey to black
Streak:
Black
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Perfect
perfect on {112}, ( {001} of the galena plane)
Density:
6.08 g/cm3 (Measured)    6.15 g/cm3 (Calculated)

Crystallography of Semseyite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Space Group Setting:
C2/c
Cell Parameters:
a = 13.64Å, b = 11.96Å, c = 24.46Å
β = 105.87°
Ratio:
a:b:c = 1.14 : 1 : 2.045
Unit Cell Volume:
V 3,838.18 ų (Calculated from Unit Cell)
Morphology:
Tabular {001}, often prismatic [010]. Also prismatic [4¯01] and [2¯01]. Crystals often twisted and composed of subparallel individuals; in globular aggregates and rosette-like groups.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.88 (60)
3.81 (90)
3.351 (70)
3.260 (100)
2.949 (90)
2.857 (80)
2.152 (50)

Optical Data of Semseyite

Type:
Anisotropic
Anisotropism:
Strong
Colour in reflected light:
White
Pleochroism:
Weak
Comments:
Very weak

Chemical Properties of Semseyite

Formula:
Pb9Sb8S21
Essential elements:
All elements listed in formula:
Common Impurities:
Ag,Cu,Fe

Relationship of Semseyite to other Species

Other Members of Group:
FülöppitePb3Sb8S15
HeteromorphitePb7Sb8S19
PlagionitePb5Sb8S17
2.HC.05bArgentobaumhaueritePb11Ag(As,Sb)18S36
2.HC.05bBaumhaueritePb12As16S36
2.HC.05eChabournéiteTl21-xPb2x(Sb,As)91-xS147 (x = 0-17.5)
2.HC.05dDufrénoysitePb2As2S5
2.HC.05aGuettarditePbAsSbS4
2.HC.05cLiveingitePb9As13S28
2.HC.05fParapierrotiteTl(Sb,As)5S8
2.HC.05fPierrotiteTl2Sb6As4S16
2.HC.05dRathitePb8Pb4-x(Tl2As2)x(Ag2As2)As16S40
2.HC.05aSartoritePbAs2S4
2.HC.05aTwinnite Pb0.8Tl0.1Sb1.3As0.8S4
2.HC.05dVeenitePb2(Sb,As)2S5
2.HC.05gMarumoitePb32As40S92
2.HC.05eDalnegroite(Tl4Pb2)(As12Sb8)S34
2.HC.10aFülöppitePb3Sb8S15
2.HC.10cHeteromorphitePb7Sb8S19
2.HC.10bPlagionitePb5Sb8S17
2.HC.10dRayitePb8(Ag,Tl)2Sb8S21
2.HC.15BoulangeritePb5Sb4S11
2.HC.15FalkmanitePb5.4Sb3.6S11
2.HC.20RobinsonitePb4Sb6S13
2.HC.25MoëloitePb6Sb6S14(S3)
2.HC.30DadsonitePb23Sb25S60Cl
2.HC.35OwyheeiteAg3+xPb10-2xSb11+xS28, -0.13 < x > +0.20
2.HC.35ZoubekiteAgPb4Sb4S10
2.HC.40ParasterryiteAg4Pb20Sb14As10S58
5.6.1SartoritePbAs2S4
5.6.2DufrénoysitePb2As2S5
5.6.3LiveingitePb9As13S28
5.6.4BaumhaueritePb12As16S36
5.6.5GratonitePb9As4S15
5.6.6JordanitePb14(As,Sb)6S23
5.6.7FülöppitePb3Sb8S15
5.6.8ZinkenitePb9Sb22S42
5.6.9PlagionitePb5Sb8S17
5.6.10HeteromorphitePb7Sb8S19
5.6.11LaunayiteCuPb10(Sb,As)12S20
5.6.12PlayfairitePb16(Sb,As)19S44Cl
5.6.14MadocitePb19(Sb,As)16S43
5.6.15BoulangeritePb5Sb4S11
5.6.17RobinsonitePb4Sb6S13
5.6.18GuettarditePbAsSbS4
5.6.19Twinnite Pb0.8Tl0.1Sb1.3As0.8S4
5.6.20VeenitePb2(Sb,As)2S5
5.6.21SorbyiteCuPb9(Sb,As)11S26
5.6.22GeocronitePb14(Sb,As)6S23
5.6.23GalenobismutitePbBi2S4
5.6.24CosalitePb2Bi2S5
5.6.25CannizzaritePb4Bi6S13
5.6.26LillianitePb3-2xAgxBi2+xS6
5.6.27GiessenitePb27Cu2(Bi,Sb)19S57
5.6.28Platynite
5.6.29XilingolitePb3Bi2S6
5.6.30WeibullitePb5Bi8Se7S11
5.6.31WittitePb9Bi12(S,Se)27
5.6.32KirkiitePb10Bi3As3S19
5.6.33UstarasitePb(Bi,Sb)6S10 (?)

Other Names for Semseyite

Name in Other Languages:
German:Semseyit
Spanish:Semseyita

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 Semseyite

Reference List:
Krenner (1881), Ak. Magyar Értes: 15: 111.

Krenner (1881), Ungarischer Revue: 367.

Krenner (1883), Zs. Kr.: 8: 532.

Spencer (1899), Mineralogical Magazine: 12: 55.

Smith (1919), Mineralogical Magazine: 18: 354.

Finály and Koch (1929), Mineralogical Magazine: 22: 179.

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: 466-468.

J. J. Kohatsu and B. J. Wuensch (1974): Prediction of structures in the homologous series Pb3+nSb8S15+2n (the plagionite group). Acta Crystallographica, B30, 2935-2937.

Kohatsu, J. J., Wuensch, B. J. (1974): Semseyite (Pb9Sb8S11) and the crystal chemistry of the plagionite group, Pb3+2nSb8S15+2n. American Mineralogist, 59, 1127-1127.

Matsushita, Y. (2010): Redetermination of crystal structure of semseyite, Pb9Sb8S21. 20th General Meeting of the IMA (IMA2010), Budapest, Hungary, August 21-27, CD of Abstracts, p. 744.

Internet Links for Semseyite

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

Localities for Semseyite

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.
Mineral and/or Locality  
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