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Twinnite

A valid IMA mineral species
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About TwinniteHide

02289740014947339554936.jpg
Robert M. Thompson
Formula:
Pb0.8Tl0.1Sb1.3As0.8S4
Simplified Pb(Sb,As)2S4.
Colour:
Black
Lustre:
Metallic
Hardness:
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.
Sartorite Group.

Related to guettardite (Sb:As = 1:1) and hyršlite (Sb:As = 6:10).


Unique IdentifiersHide

Mindat ID:
4067
Long-form identifier:
mindat:1:1:4067:5
GUID
(UUID V4):
462a0cd5-125a-40d9-b22d-2a37cc61393e

IMA Classification of TwinniteHide

Approved
IMA Formula:
Pb(Sb0.63As0.37)2S4
Approval year:
1966
First published:
1967

Classification of TwinniteHide

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
3.7.8.3

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
TwiIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of TwinniteHide

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}
Density:
5.323 g/cm3 (Calculated)

Optical Data of TwinniteHide

Reflectivity:
WavelengthR1R2
400nm39.1%45.2%
420nm38.2%44.7%
440nm37.3%44.2%
460nm36.6%43.7%
480nm36.2%43.2%
500nm35.8%42.9%
520nm35.5%42.5%
540nm35.0%42.0%
560nm34.4%41.4%
580nm34.0%40.8%
600nm33.5%40.0%
620nm33.2%39.4%
640nm32.8%38.7%
660nm32.3%38.1%
680nm31.7%37.5%
700nm31.0%37.0%

Reflectance graph
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 TwinniteHide

Mindat Formula:
Pb0.8Tl0.1Sb1.3As0.8S4

Simplified Pb(Sb,As)2S4.

Crystallography of TwinniteHide

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)°
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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0019818TwinniteMakovicky E, Topa D (2012) Twinnite, Pb0.8Tl0.1Sb1.3As0.8S4, the OD character and the question of its polytypism Zeitschrift fur Kristallographie 227 468-4752012Jas Roux, France0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of TwinniteHide

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.
Reference:
Jambor, J.L. (1967) New lead sulfantimonides from Madoc, Ontario. 2. Mineral descriptions. The Canadian Mineralogist: 9: 191-213.

Synonyms of TwinniteHide

Other Language Names for TwinniteHide

German:Twinnit
Simplified Chinese:特硫锑铅矿
Spanish:Twinnita
Traditional Chinese:特硫銻鉛礦

Relationship of Twinnite to other SpeciesHide

Member of:
Other Members of this group:
ArgentobaumhaueriteAg1.5Pb22As33.5S72Tric. 1 : P1
ArgentodufrénoysiteAg3Pb26As35S80Tric. 1 : P1
ArgentoliveingiteAg3+xPb36-2xAs51+xS112Tric. 1 : P1
BarikaiteAg3Pb10(Sb8As11)S40Mon. 2/m : P21/b
BaumhaueritePb12As16S36Tric. 1 : P1
BernarlottiitePb6(As5Sb3)S18Tric. 1 : P1
BoscardiniteTlPb4(Sb7As2)S18Tric. 1 : P1
Carducciite(Ag2Sb2)Pb12(As,Sb)16S40Mon. 2/m : P21/b
DekatriasartoriteTlPb58As97S204Mon. 2/m : P21/b
DufrénoysitePb2As2S5Mon. 2 : P21
ÉcrinsiteAgTl3Pb4As11Sb9S36Tric. 1 : P1
EnneasartoriteTl6Pb32As70S140Mon. 2/m : P21/b
GuettarditePb8(Sb0.56As0.44)16S32Mon. 2/m : P21/b
HendekasartoriteTl2Pb48As82S172Mon. 2/m : P21/b
HeptasartoriteTl7Pb22As55S108Mon. 2/m : P21/b
HyršlitePb8As10Sb6S32Mon. 2 : P21
IncomsartoriteTl6Pb144As246S516Mon. 2/m
InterliveingiteAgPb18As25S56Mon. 2 : P21
LiveingitePb9As13S28Mon. 2 : P21
ParapierrotiteTlSb5S8Mon. m
PhilrothiteTlAs3S5Mon. 2/m : P21/b
PierrotiteTl2(Sb,As)10S16Orth. mm2 : Pna21
PolloneiteAgPb46As26Sb23S120Mon. 2 : P21
RathiteAg2Pb12-xTlx/2As18+x/2S40Mon. 2/m : P21/b
SartoritePbAs2S4Mon. 2/m : P21/m
VeenitePb16Sb9-xAs7+xS40, x ~ 0-0.5Mon. 2 : P21

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Twinnite associated with Wakabayashilite[(As,Sb)6S9][As4S5]
1 photo of Twinnite associated with OrpimentAs2S3

Related Minerals - Strunz-mindat GroupingHide

2.HC.BernarlottiitePb6(As5Sb3)S18Tric. 1 : P1
2.HC.05bArgentobaumhaueriteAg1.5Pb22As33.5S72Tric. 1 : P1
2.HC.05bBaumhaueritePb12As16S36Tric. 1 : P1
2.HC.05dDufrénoysitePb2As2S5Mon. 2 : P21
2.HC.05aGuettarditePb8(Sb0.56As0.44)16S32Mon. 2/m : P21/b
2.HC.05cLiveingitePb9As13S28Mon. 2 : P21
2.HC.05fParapierrotiteTlSb5S8Mon. m
2.HC.05fPierrotiteTl2(Sb,As)10S16Orth. mm2 : Pna21
2.HC.05dRathiteAg2Pb12-xTlx/2As18+x/2S40Mon. 2/m : P21/b
2.HC.05aSartoritePbAs2S4Mon. 2/m : P21/m
2.HC.05dVeenitePb16Sb9-xAs7+xS40, x ~ 0-0.5Mon. 2 : P21
2.HC.05gMarumoitePb32As40S92Mon. 2 : P21
2.HC.05dRathite-IVPbAs2S4
2.HC.05fPhilrothiteTlAs3S5Mon. 2/m : P21/b
2.HC.05hPolloneiteAgPb46As26Sb23S120Mon. 2 : P21
2.HC.05eHeptasartoriteTl7Pb22As55S108Mon. 2/m : P21/b
2.HC.05eHendekasartoriteTl2Pb48As82S172Mon. 2/m : P21/b
2.HC.05eÉcrinsiteAgTl3Pb4As11Sb9S36Tric. 1 : P1
2.HC.05bBaumhauerite II
2.HC.05cArgentoliveingiteAg3+xPb36-2xAs51+xS112Tric. 1 : P1
2.HC.05eIncomsartoriteTl6Pb144As246S516Mon. 2/m
2.HC.05dArgentodufrénoysiteAg3Pb26As35S80Tric. 1 : P1
2.HC.05aHyršlitePb8As10Sb6S32Mon. 2 : P21
2.HC.05eDekatriasartoriteTlPb58As97S204Mon. 2/m : P21/b
2.HC.10aFülöppitePb3Sb8S15Mon. 2/m : B2/b
2.HC.10cHeteromorphitePb7Sb8S19Mon. 2/m : B2/b
2.HC.10bPlagionitePb5Sb8S17Mon. 2/m : B2/b
2.HC.10dRayitePb8(Ag,Tl)2Sb8S21Mon.
2.HC.10dSemseyitePb9Sb8S21Mon. 2/m : B2/b
2.HC.15BoulangeritePb5Sb4S11Mon. 2/m : P21/b
2.HC.15FalkmanitePb3Sb2S6Mon.
2.HC.20RobinsonitePb4Sb6S13Mon. 2/m : P21/m
2.HC.25MoëloitePb6Sb6S14(S3)Orth. 2 2 2 : P21 21 2
2.HC.30DadsonitePb23Sb25S60ClTric. 1 : P1
2.HC.35OwyheeiteAg3Pb10Sb11S28Mon. 2/m
2.HC.35ZoubekiteAgPb4Sb4S10Orth.
2.HC.40ParasterryiteAg4Pb20Sb14As10S58Mon. 2/m : P21/b
2.HC.50LopatkaitePb5Sb3AsS11Mon. 2/m : P21/b

Other InformationHide

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 TwinniteHide

References for TwinniteHide

Localities for TwinniteHide

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 ListHide

- 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.
Armenia
 
  • Syunik Province
    • Sisian
Kukulyan (1987)
Australia
 
  • Western Australia
    • Laverton Shire
      • Mount Weld Station
Brown et al. (2003)
Bolivia
 
  • Oruro
    • Cercado Province
      • Oruro
Sidki Rius (2017)
Bosnia and Herzegovina
 
  • Republika Srpska
    • Srebrenica
Slobodan A. Radosavljević et al. (2016)
Canada
 
  • British Columbia
    • Omineca Mining Division
BC Minfile data +1 other reference
  • Ontario
    • Hastings County
      • Centre Hastings Municipality
        • Huntingdon Township
Jambor (1967) +3 other references
    • Thunder Bay District
      • Bomby Township
Harris et al. (1988) +1 other reference
Sabina (1991)
  • Québec
    • Mauricie
      • Mékinac RCM
Mineral. Deposita 42 (2007)
Chile
 
  • Atacama
    • Chañaral Province
      • Potrerillos
Thompson et al. (2004)
China
 
  • Gansu
    • Gannan
      • Hezuo Co.
        • Dewulu Au-Cu ore field
Guo et al. (2023)
  • Guangxi
    • Hechi
      • Jinchengjiang District
        • Beixiang - Furongchang ore field
Jing et al. (2018)
France
 
  • Provence-Alpes-Côte d'Azur
    • Hautes-Alpes
      • Gap
        • La Chapelle-en-Valgaudemar
Johan et al. (2000) +1 other reference
India
 
  • Rajasthan
    • Udaipur Division
      • Udaipur District
Chaudhuri et al. (1980) +1 other reference
Iran
 
  • West Azerbaijan Province
    • Sardasht County
      • Sardasht
Yar Mohammadi et al. (2008)
    • Takab County
Daliran (2008)
Asadi +3 other references
Italy
 
  • Piedmont
    • Metropolitan City of Turin
      • Ceresole Reale
Maletto et al. (2013)
Kyrgyzstan
 
  • Batken Region
    • Kadamjay District
Kolesar et al. (1993)
Kolesar et al. (1993)
Mexico
 
  • Mexico
    • Temascaltepec Municipality
      • Temascaltepec de González (Temascaltepec)
Camprubi
Poland
 
  • Lower Silesian Voivodeship
    • Ząbkowice Śląskie County
      • Gmina Bardo
        • Dębowina
Nejbert et al. (2014)
Romania
 
  • Maramureș County
    • Baia Mare
Cook et al. (1997) +1 other reference
Russia
 
  • Sverdlovsk Oblast
    • Serovsky District
      • Turya river
        • Tur'insk
Kasatkin et al. (2020)
Serbia
 
Slobodan A. Radosavljević et al. (2013) +1 other reference
    • Krupanj
Moelo +8 other references
Spain
 
  • Andalusia
    • Almería
      • Pechina
        • Baños de Alhamilla
Rewitzer et al. (4)
Sweden
 
  • Västmanland County
    • Sala Municipality
      • Sala
Holmgren (2002)
USA
 
  • Nevada
    • Mineral County
      • Gabbs Valley Range
        • Santa Fe District
- (2005)
 
矿物 and/or 产地  
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