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Guettardite

A valid IMA mineral species
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About GuettarditeHide

08811400014947343803308.jpg
Jean-Étienne Guettard
Formula:
Pb8(Sb0.56As0.44)16S32
Ordered arrangement of As and Sb atoms. Also written as PbAsSbS4.
Colour:
Greyish black
Lustre:
Metallic
Hardness:
4
Specific Gravity:
5.29 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named in honor of Jean-Etienne Guettard (1715-1786), French geologist, botanist and natural historian. He is credited with the creation of the first mineralogical-geological map known (western Europe) in 1746, Carte minéralogique du Canada et de la Louisiane (Eastern Canada and USA) in 1752, followed by the Atlas minéralogique de la France (with Lavoisier) in 1767, and the Carte minéralogique de la France in 1784. Guettard was a member of the Académie des Sciences from 1743, and is the author of La minéralogie du Dauphiné (1782).
Related to twinnite (Sb:As ~ 13:8, bit variable) and hyršlite (Sb:As = 6:10).



Unique IdentifiersHide

Mindat ID:
1768
Long-form identifier:
mindat:1:1:1768:4
GUID
(UUID V4):
a2d11008-799f-4c3c-89b2-13904a563ab9

IMA Classification of GuettarditeHide

Classification of GuettarditeHide

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
3.7.8.2

3 : SULFOSALTS
7 : ø = 2
5.6.18

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

Physical Properties of GuettarditeHide

Metallic
Transparency:
Opaque
Colour:
Greyish black
Streak:
Black to brown
Hardness:
Hardness:
VHN50=180 - 197 kg/mm2 - Vickers
Tenacity:
Very brittle
Cleavage:
Perfect
Cleavage given as perfect on {001} type material, but no cleavage is given for 2nd reported occurrence.
Fracture:
Conchoidal
Density:
5.29 g/cm3 (Calculated)

Optical Data of GuettarditeHide

Reflectivity:
WavelengthR1R2imR1imR2
470nm37.6%42.6%22.3%26.1%
546nm36.1%41.2%20.4%23.6%
589nm34.8%39.3%19.5%22.9%
650nm32.8%36.7%17.9%21.2%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 42.6%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
White
Internal Reflections:
Internal reflections red in type material, none in some other material
Pleochroism:
Strong
Comments:
Nearly opaque, but a slight reddish internal reflection is observable in minute fragments under a very strong light.

Chemistry of GuettarditeHide

Mindat Formula:
Pb8(Sb0.56As0.44)16S32

Ordered arrangement of As and Sb atoms. Also written as PbAsSbS4.
Common Impurities:
Cu

Crystallography of GuettarditeHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 8.527(4) Å, b = 7.971(4) Å, c = 20.102(10) Å
β = 101.814(7)°
Ratio:
a:b:c = 1.07 : 1 : 2.522
Unit Cell V:
1,337.37 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Acicular crystals, anhedral grains.
Twinning:
polysynthetic on {100}

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0019213GuettarditeMakovicky E, Topa D, Tajjedin H, Rastad E, Yaghubpur A (2012) The crystal structure of guettardite, PbAsSbS4, and the twinnite-guettardite problem The Canadian Mineralogist 50 253-2652012Barika Au-Ag deposit in the Azarbaijan Province, western Iran0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.52 Å(100)
2.795 Å(90)
4.19 Å(50)
3.90 Å(50)
2.670 Å(50)
2.653 Å(50)
2.335 Å(40)

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 GuettarditeHide

General Appearance of Type Material:
Isolated anhedral grains.
Place of Conservation of Type Material:
Canadian Geological Survey, Ottawa, Canada, 12167.
Royal Ontario Museum, Toronto, Canada.
Geological Setting of Type Material:
Low temperature hydrothermal vein.
Associated Minerals at Type Locality:
Reference:
Jambor, J.L. (1967) New lead sulfantimonides from Madoc, Ontario. 2. Mineral descriptions. The Canadian Mineralogist: 9: 191-213.

Synonyms of GuettarditeHide

Other Language Names for GuettarditeHide

German:Guettardit
Spanish:Guettardita

Relationship of Guettardite 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
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
Twinnite Pb0.8Tl0.1Sb1.3As0.8S4Mon. 2/m
VeenitePb16Sb9-xAs7+xS40, x ~ 0-0.5Mon. 2 : P21

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Guettardite associated with ZinkenitePb9Sb22S42
1 photo of Guettardite associated with SulphurS8
1 photo of Guettardite associated with EnargiteCu3AsS4

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.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.05aTwinnite Pb0.8Tl0.1Sb1.3As0.8S4Mon. 2/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:
HNO3 tarnishes guettardite black. KOH tarnishes it iridescent, leaving a flat brownish grey colour (as with twinnite). Reactions with other standard reagents are 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 GuettarditeHide

References for GuettarditeHide

Localities for GuettarditeHide

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.
Canada
 
  • British Columbia
    • Omineca Mining Division
      • Owen Lake
  • Ontario
    • Hastings County
      • Centre Hastings Municipality
        • Huntingdon Township
Chile
 
  • Atacama
    • Chañaral Province
      • Potrerillos
France
 
  • Provence-Alpes-Côte d'Azur
    • Hautes-Alpes
      • Gap
        • La Chapelle-en-Valgaudemar
Iran
 
  • West Azerbaijan Province
    • Sardasht County
      • Sardasht
Italy
 
  • Piedmont
    • Cuneo Province
      • Ormea
    • Metropolitan City of Turin
      • Oulx
        • Signols
  • Tuscany
    • Lucca Province
      • Seravezza
Kyrgyzstan
 
  • Batken Region
    • Kadamjay District
Russia
 
  • Sverdlovsk Oblast
    • Serovsky District
      • Turya river
        • Tur'insk
Switzerland
 
  • Valais
    • Sierre
      • Lens
USA
 
  • Colorado
    • San Juan County
      • Anvil Mountain
 
Mineral and/or Locality  
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