Guettardite
A valid IMA mineral species
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About Guettardite
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).
Unique Identifiers
Mindat ID:
1768
Long-form identifier:
mindat:1:1:1768:4
GUID
(UUID V4):
(UUID V4):
a2d11008-799f-4c3c-89b2-13904a563ab9
IMA Classification of Guettardite
Approved
First published:
1967
Classification of Guettardite
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
3.7.8.2
3 : SULFOSALTS
7 : ø = 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
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 |
---|---|---|
Gue | 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 Guettardite
Metallic
Transparency:
Opaque
Colour:
Greyish black
Streak:
Black to brown
Hardness:
4 on Mohs scale
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.
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 Guettardite
Reflectivity:
Wavelength | R1 | R2 | imR1 | imR2 |
---|---|---|---|---|
470nm | 37.6% | 42.6% | 22.3% | 26.1% |
546nm | 36.1% | 41.2% | 20.4% | 23.6% |
589nm | 34.8% | 39.3% | 19.5% | 22.9% |
650nm | 32.8% | 36.7% | 17.9% | 21.2% |
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 Guettardite
Mindat Formula:
Pb8(Sb0.56As0.44)16S32
Ordered arrangement of As and Sb atoms. Also written as PbAsSbS4.
Ordered arrangement of As and Sb atoms. Also written as PbAsSbS4.
Elements listed:
Common Impurities:
Cu
Crystallography of Guettardite
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)°
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 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) |
---|---|---|---|---|---|---|---|
0019213 | Guettardite | Makovicky E, Topa D, Tajjedin H, Rastad E, Yaghubpur A (2012) The crystal structure of guettardite, PbAsSbS4, and the twinnite-guettardite problem The Canadian Mineralogist 50 253-265 | 2012 | Barika Au-Ag deposit in the Azarbaijan Province, western Iran | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 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 Guettardite
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.
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 Guettardite
Other Language Names for Guettardite
German:Guettardit
Spanish:Guettardita
Relationship of Guettardite 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 |
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 |
Twinnite | Pb0.8Tl0.1Sb1.3As0.8S4 | Mon. 2/m |
Veenite | Pb16Sb9-xAs7+xS40, x ~ 0-0.5 | Mon. 2 : P21 |
Common Associates
Associated Minerals Based on Photo Data:
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.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.05a | Twinnite | Pb0.8Tl0.1Sb1.3As0.8S4 |
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:
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 Guettardite
mindat.org URL:
https://www.mindat.org/min-1768.html
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References for Guettardite
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
Bracci, G., Dalena, D., Orlandi, P., Duchi, G., Vezzalini, G. (1980) Guettardite from Tuscany, Italy; a second occurrence. The Canadian Mineralogist, 18 (1) 13-15
Localities for Guettardite
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.
Canada | |
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Chile | |
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France | |
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Iran | |
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Italy | |
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Kyrgyzstan | |
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Russia | |
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Switzerland | |
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USA | |
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Brobdignag Mine, Anvil Mountain, San Juan County, Colorado, USA