Twinnite
A valid IMA mineral species
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About Twinnite
Formula:
Pb0.8Tl0.1Sb1.3As0.8S4
Simplified Pb(Sb,As)2S4.
Colour:
Black
Lustre:
Metallic
Hardness:
3½
Specific Gravity:
5.323 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named by John L. Jambor in 1967 in honor of Robert Mitchell Thompson (28 July 1918, Moose Jaw, Saskatchewan, Canada - 15 April 1967), professor of mineralogy, University of British Columbia, Vancouver, Canada. He had a special interest in ore minerals and deposits. Thompson means "son of Thomas"; the latter is Aramaic for "a twin". The name is doubly appropriate in alluding to the polysynthetic twinning present in the mineral.
Unique Identifiers
Mindat ID:
4067
Long-form identifier:
mindat:1:1:4067:5
GUID
(UUID V4):
(UUID V4):
462a0cd5-125a-40d9-b22d-2a37cc61393e
IMA Classification of Twinnite
Approved
IMA Formula:
Pb(Sb0.63As0.37)2S4
Approval year:
1966
First published:
1967
Classification of Twinnite
2.HC.05a
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
3.7.8.3
3 : SULFOSALTS
7 : ø = 2
3 : SULFOSALTS
7 : ø = 2
5.6.19
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 |
---|---|---|
Twi | 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 Twinnite
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Brownish black
Hardness:
3½ on Mohs scale
Hardness:
VHN50=131 - 152 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Density:
5.323 g/cm3 (Calculated)
Optical Data of Twinnite
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
400nm | 39.1% | 45.2% |
420nm | 38.2% | 44.7% |
440nm | 37.3% | 44.2% |
460nm | 36.6% | 43.7% |
480nm | 36.2% | 43.2% |
500nm | 35.8% | 42.9% |
520nm | 35.5% | 42.5% |
540nm | 35.0% | 42.0% |
560nm | 34.4% | 41.4% |
580nm | 34.0% | 40.8% |
600nm | 33.5% | 40.0% |
620nm | 33.2% | 39.4% |
640nm | 32.8% | 38.7% |
660nm | 32.3% | 38.1% |
680nm | 31.7% | 37.5% |
700nm | 31.0% | 37.0% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 45.2%.
R1 shown in black, R2 shown in red
Colour in reflected light:
white
Pleochroism:
Strong
Comments:
displays twin lamellae
Chemistry of Twinnite
Mindat Formula:
Pb0.8Tl0.1Sb1.3As0.8S4
Simplified Pb(Sb,As)2S4.
Simplified Pb(Sb,As)2S4.
Crystallography of Twinnite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 7.997(2) Å, b = 19.517(5) Å, c = 8.634(2) Å
β = 91.061(4)°
β = 91.061(4)°
Ratio:
a:b:c = 0.41 : 1 : 0.442
Unit Cell V:
1,347.34 ų (Calculated from Unit Cell)
Z:
8
Twinning:
Polysynthetic, with composition plane parallel to {100}.
Comment:
Space group P21/n. Originally assumed to be triclinic, with the cell parameters 19.58, 7.98, 8.56 A, 89.77, 89.62 and 90.27°.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
---|---|---|---|---|---|---|---|
0019818 | Twinnite | Makovicky E, Topa D (2012) Twinnite, Pb0.8Tl0.1Sb1.3As0.8S4, the OD character and the question of its polytypism Zeitschrift fur Kristallographie 227 468-475 | 2012 | Jas Roux, France | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.51 Å | (100) |
2.344 Å | (80) |
2.78 Å | (70) |
4.18 Å | (50) |
3.91 Å | (50) |
2.689 Å | (50) |
2.645 Å | (50) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Twinnite
General Appearance of Type Material:
Two megascopic grains, the larger about 1.5 mm in diameter, and four microscopic grains.
Place of Conservation of Type Material:
Canadian Geological Survey, Ottawa, Canada, 12175.
Canadian Museum of Nature, Ottawa, Canada.
Canadian Museum of Nature, Ottawa, Canada.
Reference:
Jambor, J.L. (1967) New lead sulfantimonides from Madoc, Ontario. 2. Mineral descriptions. The Canadian Mineralogist: 9: 191-213.
Synonyms of Twinnite
Other Language Names for Twinnite
Relationship of Twinnite to other Species
Member of:
Other Members of this group:
Argentobaumhauerite | Ag1.5Pb22As33.5S72 | Tric. 1 : P1 |
Argentodufrénoysite | Ag3Pb26As35S80 | Tric. 1 : P1 |
Argentoliveingite | Ag3+xPb36-2xAs51+xS112 | Tric. 1 : P1 |
Barikaite | Ag3Pb10(Sb8As11)S40 | Mon. 2/m : P21/b |
Baumhauerite | Pb12As16S36 | Tric. 1 : P1 |
Bernarlottiite | Pb6(As5Sb3)S18 | Tric. 1 : P1 |
Boscardinite | TlPb4(Sb7As2)S18 | Tric. 1 : P1 |
Carducciite | (Ag2Sb2)Pb12(As,Sb)16S40 | Mon. 2/m : P21/b |
Dekatriasartorite | TlPb58As97S204 | Mon. 2/m : P21/b |
Dufrénoysite | Pb2As2S5 | Mon. 2 : P21 |
Écrinsite | AgTl3Pb4As11Sb9S36 | Tric. 1 : P1 |
Enneasartorite | Tl6Pb32As70S140 | Mon. 2/m : P21/b |
Guettardite | Pb8(Sb0.56As0.44)16S32 | Mon. 2/m : P21/b |
Hendekasartorite | Tl2Pb48As82S172 | Mon. 2/m : P21/b |
Heptasartorite | Tl7Pb22As55S108 | Mon. 2/m : P21/b |
Hyršlite | Pb8As10Sb6S32 | Mon. 2 : P21 |
Incomsartorite | Tl6Pb144As246S516 | Mon. 2/m |
Interliveingite | AgPb18As25S56 | Mon. 2 : P21 |
Liveingite | Pb9As13S28 | Mon. 2 : P21 |
Parapierrotite | TlSb5S8 | Mon. m |
Philrothite | TlAs3S5 | Mon. 2/m : P21/b |
Pierrotite | Tl2(Sb,As)10S16 | Orth. mm2 : Pna21 |
Polloneite | AgPb46As26Sb23S120 | Mon. 2 : P21 |
Rathite | Ag2Pb12-xTlx/2As18+x/2S40 | Mon. 2/m : P21/b |
Sartorite | PbAs2S4 | Mon. 2/m : P21/m |
Veenite | Pb16Sb9-xAs7+xS40, x ~ 0-0.5 | Mon. 2 : P21 |
Common Associates
Associated Minerals Based on Photo Data:
3 photos of Twinnite associated with Wakabayashilite | [(As,Sb)6S9][As4S5] |
1 photo of Twinnite associated with Orpiment | As2S3 |
Related Minerals - Strunz-mindat Grouping
2.HC. | Bernarlottiite | Pb6(As5Sb3)S18 |
2.HC.05b | Argentobaumhauerite | Ag1.5Pb22As33.5S72 |
2.HC.05b | Baumhauerite | Pb12As16S36 |
2.HC.05d | Dufrénoysite | Pb2As2S5 |
2.HC.05a | Guettardite | Pb8(Sb0.56As0.44)16S32 |
2.HC.05c | Liveingite | Pb9As13S28 |
2.HC.05f | Parapierrotite | TlSb5S8 |
2.HC.05f | Pierrotite | Tl2(Sb,As)10S16 |
2.HC.05d | Rathite | Ag2Pb12-xTlx/2As18+x/2S40 |
2.HC.05a | Sartorite | PbAs2S4 |
2.HC.05d | Veenite | Pb16Sb9-xAs7+xS40, x ~ 0-0.5 |
2.HC.05g | Marumoite | Pb32As40S92 |
2.HC.05d | Rathite-IV | PbAs2S4 |
2.HC.05f | Philrothite | TlAs3S5 |
2.HC.05h | Polloneite | AgPb46As26Sb23S120 |
2.HC.05e | Heptasartorite | Tl7Pb22As55S108 |
2.HC.05e | Hendekasartorite | Tl2Pb48As82S172 |
2.HC.05e | Écrinsite | AgTl3Pb4As11Sb9S36 |
2.HC.05b | Baumhauerite II | |
2.HC.05c | Argentoliveingite | Ag3+xPb36-2xAs51+xS112 |
2.HC.05e | Incomsartorite | Tl6Pb144As246S516 |
2.HC.05d | Argentodufrénoysite | Ag3Pb26As35S80 |
2.HC.05a | Hyršlite | Pb8As10Sb6S32 |
2.HC.05e | Dekatriasartorite | TlPb58As97S204 |
2.HC.10a | Fülöppite | Pb3Sb8S15 |
2.HC.10c | Heteromorphite | Pb7Sb8S19 |
2.HC.10b | Plagionite | Pb5Sb8S17 |
2.HC.10d | Rayite | Pb8(Ag,Tl)2Sb8S21 |
2.HC.10d | Semseyite | Pb9Sb8S21 |
2.HC.15 | Boulangerite | Pb5Sb4S11 |
2.HC.15 | Falkmanite | Pb3Sb2S6 |
2.HC.20 | Robinsonite | Pb4Sb6S13 |
2.HC.25 | Moëloite | Pb6Sb6S14(S3) |
2.HC.30 | Dadsonite | Pb23Sb25S60Cl |
2.HC.35 | Owyheeite | Ag3Pb10Sb11S28 |
2.HC.35 | Zoubekite | AgPb4Sb4S10 |
2.HC.40 | Parasterryite | Ag4Pb20Sb14As10S58 |
2.HC.50 | Lopatkaite | Pb5Sb3AsS11 |
Other Information
Notes:
KOH rapidly tarnishes twinnite iridescent and leaves a characteristic flat brownish grey colour when the reagent is rubbed off. 1:1 HNO3, rapidly tarnishes the mineral black. Other reagents test negative.
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 Twinnite
mindat.org URL:
https://www.mindat.org/min-4067.html
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References for Twinnite
Reference List:
Jambor, John Leslie (1967) New lead sulfantimonides from Madoc, Ontario. Part 1. The Canadian Mineralogist, 9 (1) 7-24
Jambor, John Leslie (1967) New lead sulfantimonides from Madoc, Ontario. Part 2 - mineral descriptions. The Canadian Mineralogist, 9 (2) 191-213
Jambor, John Leslie (1968) New lead sulfantimonides from Madoc, Ontario. Part 3-syntheses, paragenesis, origin. The Canadian Mineralogist, 9 (4) 505-521
Topa, Dan, Makovicky, Emil (2012) Twinnite, Pb0.8Tl0.1Sb1.3As0.8S4, the OD character and the question of its polytypism. Zeitschrift für Kristallographie - Crystalline Materials, 227 (7) 468-475 doi:10.1524/zkri.2012.1491
Localities for Twinnite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Armenia | |
| Kukulyan (1987) |
Australia | |
| Brown et al. (2003) |
Bolivia | |
| Sidki Rius (2017) |
Bosnia and Herzegovina | |
| Slobodan A. Radosavljević et al. (2016) |
Canada | |
| BC Minfile data +1 other reference |
| Jambor (1967) +3 other references |
| Harris et al. (1988) +1 other reference |
Sabina (1991) | |
| Mineral. Deposita 42 (2007) |
Chile | |
| Thompson et al. (2004) |
China | |
| Guo et al. (2023) |
| Jing et al. (2018) |
France | |
| Johan et al. (2000) +1 other reference |
India | |
| Chaudhuri et al. (1980) +1 other reference |
Iran | |
| Yar Mohammadi et al. (2008) |
| Daliran (2008) |
Asadi +3 other references | |
Italy | |
| Maletto et al. (2013) |
Kyrgyzstan | |
| Kolesar et al. (1993) |
Kolesar et al. (1993) | |
Mexico | |
| Camprubi |
Poland | |
| Nejbert et al. (2014) |
Romania | |
| Cook et al. (1997) +1 other reference |
Russia | |
| Kasatkin et al. (2020) |
Serbia | |
Slobodan A. Radosavljević et al. (2013) +1 other reference | |
| Moelo +8 other references |
Spain | |
| Rewitzer et al. (4) |
Sweden | |
| Holmgren (2002) |
USA | |
| - (2005) |
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Jas Roux, La Chapelle-en-Valgaudemar, Gap, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France