Semseyite
A valid IMA mineral species - grandfathered
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About Semseyite
Formula:
Pb9Sb8S21
Colour:
Steel-grey to black
Lustre:
Metallic
Hardness:
2½
Specific Gravity:
6.08
Crystal System:
Monoclinic
Member of:
Name:
For Andor von Semsey (22 December 1833, Kassa, Hungary - 14 August 1923, Budapest, Hungary), a Nobleman and amateur mineralogist. The mineral andorite is also named after him.
Type Locality:
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.
Stoichiometrically similar to heteromorphite.
Stoichiometrically similar to heteromorphite.
Unique Identifiers
Mindat ID:
3616
Long-form identifier:
mindat:1:1:3616:6
IMA Classification of Semseyite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Pb2+9Sb3+8S2-21
First published:
1881
Type description reference:
Classification of Semseyite
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
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
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
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
6 : Sulpharsenites etc. of Pb alone
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ssy | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Semseyite
Metallic
Transparency:
Opaque
Colour:
Steel-grey to black
Streak:
Black
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
perfect on {112}, ( {001} of the galena plane)
perfect on {112}, ( {001} of the galena plane)
Density:
6.08 g/cm3 (Measured) 6.15 g/cm3 (Calculated)
Optical Data of Semseyite
Anisotropism:
Strong
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 38.6% | 44.5% |
| 420nm | 38.3% | 44.2% |
| 440nm | 38.0% | 43.9% |
| 460nm | 37.7% | 43.6% |
| 480nm | 37.4% | 43.3% |
| 500nm | 37.2% | 43.1% |
| 520nm | 37.0% | 42.8% |
| 540nm | 36.7% | 42.5% |
| 560nm | 36.4% | 42.2% |
| 580nm | 36.0% | 41.7% |
| 600nm | 35.4% | 41.1% |
| 620nm | 34.9% | 40.4% |
| 640nm | 34.3% | 39.8% |
| 660nm | 33.6% | 39.1% |
| 680nm | 32.9% | 38.4% |
| 700nm | 32.2% | 37.6% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 44.5%.
R1 shown in black, R2 shown in red
Colour in reflected light:
White
Pleochroism:
Weak
Comments:
Very weak
Chemistry of Semseyite
Mindat Formula:
Pb9Sb8S21
Element Weights:
Elements listed:
Common Impurities:
Ag,Cu,Fe
Crystallography of Semseyite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 13.64 Å, b = 11.96 Å, c = 24.46 Å
β = 105.87°
β = 105.87°
Ratio:
a:b:c = 1.14 : 1 : 2.045
Unit Cell 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.
Comment:
Matsushita (2018) gives: a = 13.6267(10) Å, b = 11.9742(9) Å, c = 24.5891(18) Å, β = 105.997(3)°, V = 3856.8(5) Å3.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000427 | Semseyite | Kohatsu J J, Wuensch B J (1974) Semseyite (Pb9Sb8S21) and the crystal chemistry of the plagionite group, Pb3+2nSb8S15+2n American Mineralogist 59 1127-1127 | ![]() | 1974 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.88 Å | (60) |
| 3.81 Å | (90) |
| 3.351 Å | (70) |
| 3.260 Å | (100) |
| 2.949 Å | (90) |
| 2.857 Å | (80) |
| 2.152 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Semseyite
Other Language Names for Semseyite
Relationship of Semseyite to other Species
Member of:
Other Members of Plagionite Group:
| Fülöppite | Pb3Sb8S15 | Mon. 2/m : B2/b |
| Heteromorphite | Pb7Sb8S19 | Mon. 2/m : B2/b |
| Plagionite | Pb5Sb8S17 | Mon. 2/m : B2/b |
Common Associates
Associations Based on Photo Data:
| 139 photos of Semseyite associated with Sphalerite | ZnS |
| 117 photos of Semseyite associated with Quartz | SiO2 |
| 100 photos of Semseyite associated with Galena | PbS |
| 71 photos of Semseyite associated with Siderite | FeCO3 |
| 50 photos of Semseyite associated with Boulangerite | Pb5Sb4S11 |
| 47 photos of Semseyite associated with Calcite | CaCO3 |
| 45 photos of Semseyite associated with Fizélyite | Ag5Pb14Sb21S48 |
| 43 photos of Semseyite associated with 'Sphärosiderite' | FeCO3 |
| 35 photos of Semseyite associated with Chalcopyrite | CuFeS2 |
| 35 photos of Semseyite associated with Pyrite | FeS2 |
Related Minerals - Strunz-mindat Grouping
| 2.HC. | Bernarlottiite | Pb6(As5Sb3)S18 |
| 2.HC. | Huntingdonite | Pb19Sb16As6S51Cl2 |
| 2.HC. | Moiraite | Pb12Sb8As8S36 |
| 2.HC.05f | Parapierrotite | TlSb5S8 |
| 2.HC.05g | Marumoite | Pb32As40S92 |
| 2.HC.05b | Baumhauerite II | |
| 2.HC.05d | Rathite | Ag2Pb12-xTlx/2As18+x/2S40 |
| 2.HC.05e | Heptasartorite | Tl7Pb22As55S108 |
| 2.HC.05d | Dufrénoysite | Pb2As2S5 |
| 2.HC.05e | Hendekasartorite | Tl2Pb48As82S172 |
| 2.HC.05b | Argentobaumhauerite | Ag1.5Pb22As33.5S72 |
| 2.HC.05c | Argentoliveingite | Ag3+xPb36-2xAs51+xS112 |
| 2.HC.05b | Baumhauerite | Pb12As16S36 |
| 2.HC.05d | Veenite | Pb16Sb9-xAs7+xS40, x ~ 0-0.5 |
| 2.HC.05e | Dekatriasartorite | TlPb58As97S204 |
| 2.HC.05a | Hyršlite | Pb8As10Sb6S32 |
| 2.HC.05e | Incomsartorite | Tl6Pb144As246S516 |
| 2.HC.05c | Liveingite | Pb20As24S56 |
| 2.HC.05c | Johnjamborite | Pb14Sb8.5As7.5S38 |
| 2.HC.05f | Pierrotite | Tl2(Sb,As)10S16 |
| 2.HC.05d | Rathite-IV | PbAs2S4 |
| 2.HC.05d | Argentodufrénoysite | Ag3Pb26As35S80 |
| 2.HC.05e | Écrinsite | AgTl3Pb4As11Sb9S36 |
| 2.HC.05a | Sartorite | PbAs2S4 |
| 2.HC.05a | Twinnite | Pb0.8Tl0.1Sb1.3As0.8S4 |
| 2.HC.05f | Philrothite | TlAs3S5 |
| 2.HC.05h | Polloneite | AgPb46As26Sb23S120 |
| 2.HC.05a | Guettardite | Pb8(Sb0.56As0.44)16S32 |
| 2.HC.10a | Fülöppite | Pb3Sb8S15 |
| 2.HC.10d | Rayite | Pb8(Ag,Tl)2Sb8S21 |
| 2.HC.10c | Heteromorphite | Pb7Sb8S19 |
| 2.HC.10b | Plagionite | Pb5Sb8S17 |
| 2.HC.15 | Falkmanite | Pb3Sb2S6 |
| 2.HC.15 | Boulangerite | Pb5Sb4S11 |
| 2.HC.20 | Robinsonite | Pb4Sb6S13 |
| 2.HC.25 | Moëloite | Pb6Sb6S14(S3) |
| 2.HC.30 | Dadsonite | Pb23Sb25S60Cl |
| 2.HC.35 | Zoubekite | AgPb4Sb4S10 |
| 2.HC.35 | Proto-owyheeite | Ag9Pb40Sb45S112 |
| 2.HC.35 | Owyheeite | Ag3Pb10Sb11S28 |
| 2.HC.40 | Parasterryite | Ag4Pb20Sb14As10S58 |
| 2.HC.50 | Lopatkaite | Pb5Sb3AsS11 |
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.
Internet Links for Semseyite
mindat.org URL:
https://www.mindat.org/min-3616.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Semseyite
Reference List:
Spencer, L. J., Prior, G. T. (1899) Plagionite, Heteromorphite and Semseyite as Members of a Natural Group of Minerals. Mineralogical Magazine and Journal of the Mineralogical Society, 12 (55) 55-68 doi:10.1180/minmag.1899.012.55.02
Herbert Smith, G. F., Prior, G. T. (1919) Semseyite from Dumfriesshire. Mineralogical Magazine and Journal of the Mineralogical Society, 18 (87) 354-359 doi:10.1180/minmag.1919.018.87.03
Finály, I. de, Koch, Sándor (1929) Fülöppite, a new Hungarian mineral of the plagionite-semseyite group. Mineralogical Magazine and Journal of the Mineralogical Society, 22 (127) 179-184 doi:10.1180/minmag.1929.022.127.03
Localities for Semseyite
Showing 229 localities.
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Putz et al. (2009) |
| Brodtkorb (2002) +1 other reference |
| Silver Standard Resources Inc |
| Coira et al. (1995) +1 other reference |
| Brodtkorb (2002) |
| Brodtkorb (2002) | |
Armenia | |
| Kukulyan (1982) +2 other references |
Australia | |
| Sung (2008) |
Austria | |
| G.Blaß |
| 50 +2 other references |
Bolivia | |
| Wilson (2001) |
| Wilson (2001) | |
| Wilson (2001) +1 other reference |
| Torres et al. (2019) |
| Salomon Rivas y Federico Ahlfeld (1998) |
| Kempff et al. (La Paz, 2009) | |
| Salomon Rivas y Federico Ahlfeld (1998) |
| Salomon Rivas y Federico Ahlfeld (1998) |
| Cazorla Martínez et al. (2019) | |
| Torró et al. (2019) | |
| Kempff et al. (La Paz, 2009) | |
| USGS Bulletin # 1975 |
| Salomon Rivas y Federico Ahlfeld (1998) | |
| Geology and Mineral Resources of the Altiplano and Cordillera Occidental (USGS Bulletin no. 1975) |
| Torró et al. (2019) |
Bosnia and Herzegovina | |
| Radosavljević et al. (2016) |
Bulgaria | |
| Breskovska et al. (1982) |
Canada | |
| Woodside et al. (2000) |
| Coleman (1953) |
| Coleman (1953) | |
| Jambor (1967) +1 other reference |
| unpublished BSc. thesis +2 other references |
China | |
| Cao et al. (2025) |
| Jensen (2009) +1 other reference |
| Li et al. (2019) |
| Yan Liu et al. (2011) |
Czech Republic | |
| Žáček et al. (1992) |
| Pažout et al. (2017) | |
| Pažout et al. (2017) |
| Škácha et al. (2012) |
| Dolníček et al. (2023) |
| Sejkora et al. (2008) |
| Škácha et al. (2021) | |
| C.Auer (2016) |
| Wiesner I.: Nálezy některých ... |
France | |
| R. Pierrot |
| Périchaud (1968) |
| Périchaud (1968) | |
| Périchaud (1968) | |
| Pélisson (1989) |
| Périchaud (1968) | |
| |
| J.-J. Périchaud: "Les Minéraux ... |
| J.-J. Périchaud: Les Minéraux d'Auvergne et al. (1986) |
| Pélisson (1989) |
| Pélisson (1989) |
| |
| Pélisson (1989) | |
| Pélisson (1989) |
| Alain Tuel collection |
| Périchaud (1968) |
| Marcoux et al. (1988) |
| |
| Ducluzaux B. (2021) |
| Chauris (2014) |
| Pierrot et al. (1973) |
| Pierrot et al. (1973) |
| Chauris (2014) |
| Moëlo et al. (1978) |
| Moëlo et al. (1978) |
| Y. Moëlo |
| Wittern +1 other reference |
| This mine worked the same vein as Gabe ... +2 other references | |
| Hohl (1994) |
| |
| Michel Treillard collection |
| Brousse (1982) |
| Y. Moëlo |
| Inventaire Mineralogique de la France ... |
| Picot et al. (1982) |
| |
| Bernadi (2004) |
| Fourcault (1993) |
| Fourcault (1993) +1 other reference | |
| Moëlo et al. (1975) +1 other reference |
| R. Pierrot |
| Mari (1996) |
Germany | |
| Walenta (1992) |
| Walenta (1989) +1 other reference |
| Field collected by Gunther Grundmann ... |
| 50. (in German) +1 other reference |
| undefined +2 other references |
| Weiß (1990) | |
| Weiß (1990) |
| Meier (1995) |
| |
| Eigenfund auf der Halde der Grube ... +2 other references |
| Wagner et al. (2000) |
| Schnorrer-Köhler (1989) | |
| Wagner et al. (2000) |
| Penkert et al. (1995) | |
| Wagner et al. (2000) | |
| Schnorrer-Köhler (1991) |
| Schnorrer (1995) +1 other reference |
| Wagner et al. (2000) |
| Wittern (2001) |
| Wagner et al. (2000) |
| Wittern (2001) |
| Wagner et al. (2000) |
| Wagner et al. (2000) |
| Wagner et al. (2000) |
| Wagner et al. (2000) |
| Wagner et al. (2000) |
| Wagner et al. (2000) |
| Wagner et al. (2000) |
| Wagner et al. (2000) |
| Wagner et al. (2000) |
| Wagner et al. (2000) |
| Wittern (2001) |
| Gröbner et al. (2011) |
| Gröbner et al. (2011) | |
| Wittern (2001) |
| 43-47 +3 other references |
Greece | |
| Voudouris et al. (2008) |
| Voudouris et al. (2018) |
| Uwe Kolitsch and Branko Rieck (unpubl. SEM-EDS results) |
| Voudouris et al. (2008) | |
| Kanellopoulos et al. (2024) |
| Michael (2004) |
Hungary | |
| Koch (1985) |
| Szakáll et al. (1996) |
| Szakáll et al. (2012) | |
India | |
| Mishra et al. (2009) |
Iran | |
| Daliran (2008) |
| Asadi +3 other references | |
Ireland | |
| |
Italy | |
| Piccoli et al. (2007) |
| Brizzi G. et al. (GR) |
| Giuliano bettini collection |
| Orlandi et al. (1996) +1 other reference |
| Orlandi et al. (1994) +1 other reference |
| Orlandi et al. (1994) |
| Morino et al. (2016) |
| Orlandi et al. (1994) +2 other references |
| Orlandi et al. (2009) | |
| Orlandi et al. (2000) +1 other reference |
| Hollis et al. (2021) |
Japan | |
| ISHIYAMA et al. (1990) |
| AKATSUKA (1961) |
| Fujiwara (1994) |
| HARADA et al. (1970) | |
Kazakhstan | |
| Spiridonov (2014) |
Kosovo | |
| Kluza et al. (2024) |
| Mederski et al. (2021) +1 other reference |
| Mederski et al. (2019) |
Mexico | |
| Rubinovich-Kogan et al. (1988) +1 other reference |
New Zealand | |
| Grapes et al. (1999) |
| Grapes et al. (1999) | |
Peru | |
| Gibson (1992) |
| Crowley et al. (1997) |
| Duval et al. (1986) | |
| Lewis (1964) |
| Lewis (1964) | |
| Lewis (1964) |
| Lewis (1964) | |
Poland | |
| Kozłowski et al. (2024) |
| Kozłowski et al. (2024) | |
Portugal | |
| Alves (n.d.) |
| Alves (n.d.) +1 other reference | |
Romania | |
| Ciobanu et al. (2004) |
| Bailly et al. (1998) |
| Damian +8 other references | |
| Palache et al. (1944) | |
| |
| Buzatu et al. (2015) | |
| Damian +8 other references |
| Mariaș (2005) | |
| KOVÁCS et al. (2020) |
| Clain et al. (2006) |
| Macaleţ et al. (1994) +1 other reference |
Russia | |
| Pavlova et al. (2009) |
| Borisenko et al. (1999) | |
| Kalinin +3 other references |
| Pavlova et al. (2009) |
| Pavlova et al. (2009) | |
| Kasatkin et al. (2020) +1 other reference |
| Hyršl (1992) |
| Eremin et al. (2023) |
| Spiridonov et al. (2010) +1 other reference |
Serbia | |
| Mineco Limited |
Slovakia | |
| Koděra et al. (1986) |
| Maťo et al. (stredné Slovensko) |
| Martin Števko-unpublished |
| Duda et. all. |
| specialities of chemical composition. ... +1 other reference | |
| Chovan et al. (1998) |
| Topa et al. (2012) |
Spain | |
| Valladares et al. (2021) |
| Georges FAVREAU collection & EDX ... | |
| Rewitzer et al. (2019) |
| Calvo Rebollar (2003) |
| Calvo Rebollar (2003) |
| mineralespania.blogspot.fr (n.d.) |
Switzerland | |
| EDS analysis (EDXPR_2298) |
| Meisser N. et al. (2020) | |
Tajikistan | |
| Pavlova et al. (2009) |
| Evseev et al. (2004) |
UK | |
| Golley et al. (1995) |
| Fortey et al. (1984) +1 other reference |
| Stanley et al. (1991) | |
| www.english-nature.org.uk (2016) |
| Williams (1973) +1 other reference |
| |
| R. E. Bevins (1988) +2 other references |
Ukraine | |
| [World of Stones 12:20] |
USA | |
| Howard (2007) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) | |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) | |
| - (2005) |
| Laszlo Dudas dealer stock (Continental Minerals) |
| Smith et al. (2000) |
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