Guettardite (original) (raw)
A valid IMA mineral species
About GuettarditeHide
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Formula:
Pb8(Sb0.56As0.44)16S32
Ordered arrangement of As and Sb atoms. Also written as PbAsSbS4.
Specific Gravity:
5.29 (Calculated)
Crystal System:
Monoclinic
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 IdentifiersHide
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Long-form identifier:
mindat:1:1:1768:4
a2d11008-799f-4c3c-89b2-13904a563ab9
IMA Classification of GuettarditeHide
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Type description reference:
Classification of GuettarditeHide
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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
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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 GuettarditeHide
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Hardness:
VHN50=180 - 197 kg/mm2 - Vickers
Cleavage:
Perfect
Cleavage given as perfect on {001} type material, but no cleavage is given for 2nd reported occurrence.
Density:
5.29 g/cm3 (Calculated)
Optical Data of GuettarditeHide
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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
Comments:
Nearly opaque, but a slight reddish internal reflection is observable in minute fragments under a very strong light.
Chemistry of GuettarditeHide
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Mindat Formula:
Pb8(Sb0.56As0.44)16S32
Ordered arrangement of As and Sb atoms. Also written as PbAsSbS4.
Crystallography of GuettarditeHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
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)
Morphology:
Acicular crystals, anhedral grains.
Twinning:
polysynthetic on {100}
Crystal StructureHide
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| 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 DiffractionHide
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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 EnvironmentHide
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Type Occurrence of GuettarditeHide
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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
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Other Language Names for GuettarditeHide
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Relationship of Guettardite to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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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
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References for GuettarditeHide
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Reference List:
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
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 (2) 253-265 doi:10.3749/canmin.50.2.253
Localities for GuettarditeHide
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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
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- 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.