Parasterryite
A valid IMA mineral species
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About Parasterryite
Formula:
Ag4Pb20Sb14As10S58
Colour:
Black
Lustre:
Metallic
Hardness:
3 - 3½
Specific Gravity:
5.747 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Name derives from the Greek 'para' for near, and sterryite, reflecting the close structural relationship between the two minerals.
Closely related to sterryite.
Chemically similar to, i.a., arsenquatrandorite, barikaite, jasrouxite, montpelvouxite, and polloneite.
Chemically similar to, i.a., arsenquatrandorite, barikaite, jasrouxite, montpelvouxite, and polloneite.
Unique Identifiers
Mindat ID:
40289
Long-form identifier:
mindat:1:1:40289:7
IMA Classification of Parasterryite
Approved
IMA Formula:
Ag1+4Pb2+20(Sb3+,As3+)24S2-58
Approval year:
2010
First published:
2011
Type description reference:
Moëlo, Y., Orlandi, P., Guillot-Deudon, C., Biagioni, C., Paar, W., Evain, M. (2011) LEAD-ANTIMONY SULFOSALTS FROM TUSCANY (ITALY). XI. THE NEW MINERAL SPECIES PARASTERRYITE, Ag4Pb20(Sb14.5As9.5) 24S58, AND ASSOCIATED STERRYITE, Cu(Ag,Cu)3Pb19(Sb,As)22(As-As)S56, FROM THE POLLONE MINE, TUSCANY, ITALY. The Canadian Mineralogist, 49 (2). 623-638 doi:10.3749/canmin.49.2.623
Classification of Parasterryite
2.HC.40
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
3.5.12.2
3 : SULFOSALTS
5 : 2.5 < ø < 3
3 : SULFOSALTS
5 : 2.5 < ø < 3
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 for Standard |
|---|---|---|
| Psty | 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 Parasterryite
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN25=196 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Fracture:
Conchoidal
Density:
5.747 g/cm3 (Calculated)
Optical Data of Parasterryite
Anisotropism:
Distinct in air, strong in oil. Greenish and brownish tints.
Bireflectance:
Distinct
Reflectivity:
| Wavelength | R1 (%) | R2 (%) | imR1 (%) | imR2 (%) |
|---|---|---|---|---|
| 400nm | 32.6% | 37.8% | 19.8% | 20.5% |
| 420nm | 35.0% | 40.2% | 18.0% | 21.1% |
| 440nm | 34.5% | 40.2% | 18.9% | 21.6% |
| 460nm | 35.1% | 40.9% | 19.3% | 22.1% |
| 470nm | 35.1% | 40.8% | 19.4% | 22.2% |
| 480nm | 34.8% | 40.8% | 19.6% | 22.3% |
| 500nm | 34.3% | 40.1% | 19.5% | 22.1% |
| 520nm | 33.6% | 39.7% | 19.5% | 22.0% |
| 540nm | 33.7% | 39.6% | 19.4% | 21.8% |
| 546nm | 33.5% | 39.3% | 19.3% | 21.7% |
| 560nm | 33.3% | 39.0% | 19.0% | 21.6% |
| 580nm | 32.9% | 38.7% | 18.8% | 21.5% |
| 589nm | 32.7% | 38.2% | 18.7% | 21.1% |
| 600nm | 32.5% | 38.0% | 18.3% | 20.9% |
| 620nm | 32.3% | 37.5% | 18.0% | 20.4% |
| 640nm | 31.6% | 36.4% | 17.5% | 19.8% |
| 650nm | 31.4% | 36.5% | 17.3% | 19.5% |
| 660nm | 31.3% | 36.3% | 17.0% | 19.3% |
| 680nm | 30.8% | 35.4% | 16.3% | 18.5% |
| 700nm | 30.4% | 34.6% | 16.1% | 18.2% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 40.9%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
White
Internal Reflections:
None
Pleochroism:
Weak
Comments:
Greyish white to white, more distinct in oil
Chemistry of Parasterryite
Mindat Formula:
Ag4Pb20Sb14As10S58
Element Weights:
Crystallography of Parasterryite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 8.3965(5) Å, b = 27.9540(7) Å, c = 43.8840(13) Å
β = 90.061(12)°
β = 90.061(12)°
Ratio:
a:b:c = 0.3 : 1 : 1.57
Unit Cell V:
10,300.26 ų (Calculated from Unit Cell)
Twinning:
Commonly twinned on (001). Polysynthetic.
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) |
|---|---|---|---|---|---|---|---|
| 0019483 | Parasterryite | Moelo Y, Guillot-Deudon C, Evain M, Orlandi P, Biagioni C (2012) Comparative modular analysis of two complex sulfosalt structures: sterryite, Cu(Ag,Cu)3Pb19-(Sb,As)22(As-As)S56, and parasterryite, Ag4Pb20(Sb,As)24S58 Acta Crystallographica B68 480-492 | ![]() | 2012 | Pollone mine, Tuscany, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.62 Å | (100) |
| 3.42 Å | (45) |
| 3.35 Å | (95) |
| 3.23 Å | (65) |
| 3.01 Å | (45) |
| 2.945 Å | (85) |
| 2.885 Å | (80) |
| 1.916 Å | (45) |
Reference:
Moëlo, Y., Orlandi, P., Guillot-Deudon, C., Biagioni, C., Paar, W., Evain, M. (2011) LEAD-ANTIMONY SULFOSALTS FROM TUSCANY (ITALY). XI. THE NEW MINERAL SPECIES PARASTERRYITE, Ag4Pb20(Sb14.5As9.5) 24S58, AND ASSOCIATED STERRYITE, Cu(Ag,Cu)3Pb19(Sb,As)22(As-As)S56, FROM THE POLLONE MINE, TUSCANY, ITALY. The Canadian Mineralogist, 49 (2). 623-638 doi:10.3749/canmin.49.2.623
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Parasterryite
General Appearance of Type Material:
Acicular crystals up to 4 x 0.3 mm in vugs. Striated along their elongation.
Place of Conservation of Type Material:
Museo di Storia Naturale e del Territorio, Universita` di Pisa, Italy, catalogue number 19347.
Museum of Mineralogy, Ecoles des Mines de Paris, catalogue, 82522.
Museum of Mineralogy, Ecoles des Mines de Paris, catalogue, 82522.
Associated Minerals at Type Locality:
Reference:
Moëlo, Y., Orlandi, P., Guillot-Deudon, C., Biagioni, C., Paar, W., Evain, M. (2011) LEAD-ANTIMONY SULFOSALTS FROM TUSCANY (ITALY). XI. THE NEW MINERAL SPECIES PARASTERRYITE, Ag4Pb20(Sb14.5As9.5) 24S58, AND ASSOCIATED STERRYITE, Cu(Ag,Cu)3Pb19(Sb,As)22(As-As)S56, FROM THE POLLONE MINE, TUSCANY, ITALY. The Canadian Mineralogist, 49 (2). 623-638 doi:10.3749/canmin.49.2.623
Other Language Names for Parasterryite
Dutch:Parasterryiet
German:Parasterryit
Relationship of Parasterryite to other Species
Member of:
Other Members of Sterryite Group:
| Ciriottiite | Cu(Cu,Ag)3Pb19(Sb,As)22(As2)S56 | Mon. 2/m |
| Hayyanite | Cu5Ag11Pb76Sb71As17(As2+)8S224 | Mon. 2/m : P21/b |
| Sterryite | Cu(Ag,Cu)3Pb19(Sb,As)22(As2)S56 | Mon. 2/m |
Related Minerals - Strunz-mindat Grouping
| 2.HC. | Bernarlottiite | Pb6(As5Sb3)S18 |
| 2.HC. | Huntingdonite | Pb19Sb16As6S51Cl2 |
| 2.HC. | Moiraite | Pb12Sb8As8S36 |
| 2.HC.05f | Parapierrotite | TlSb5S8 |
| 2.HC.05g | Marumoite | Pb32As40S92 |
| 2.HC.05b | Baumhauerite II | |
| 2.HC.05d | Rathite | Ag2Pb12-xTlx/2As18+x/2S40 |
| 2.HC.05e | Heptasartorite | Tl7Pb22As55S108 |
| 2.HC.05d | Dufrénoysite | Pb2As2S5 |
| 2.HC.05e | Hendekasartorite | Tl2Pb48As82S172 |
| 2.HC.05b | Argentobaumhauerite | Ag1.5Pb22As33.5S72 |
| 2.HC.05c | Argentoliveingite | Ag3+xPb36-2xAs51+xS112 |
| 2.HC.05b | Baumhauerite | Pb12As16S36 |
| 2.HC.05d | Veenite | Pb16Sb9-xAs7+xS40, x ~ 0-0.5 |
| 2.HC.05e | Dekatriasartorite | TlPb58As97S204 |
| 2.HC.05a | Hyršlite | Pb8As10Sb6S32 |
| 2.HC.05e | Incomsartorite | Tl6Pb144As246S516 |
| 2.HC.05c | Liveingite | Pb20As24S56 |
| 2.HC.05c | Johnjamborite | Pb14Sb8.5As7.5S38 |
| 2.HC.05f | Pierrotite | Tl2(Sb,As)10S16 |
| 2.HC.05d | Rathite-IV | PbAs2S4 |
| 2.HC.05d | Argentodufrénoysite | Ag3Pb26As35S80 |
| 2.HC.05e | Écrinsite | AgTl3Pb4As11Sb9S36 |
| 2.HC.05a | Sartorite | PbAs2S4 |
| 2.HC.05a | Twinnite | Pb0.8Tl0.1Sb1.3As0.8S4 |
| 2.HC.05f | Philrothite | TlAs3S5 |
| 2.HC.05h | Polloneite | AgPb46As26Sb23S120 |
| 2.HC.05a | Guettardite | Pb8(Sb0.56As0.44)16S32 |
| 2.HC.10a | Fülöppite | Pb3Sb8S15 |
| 2.HC.10d | Semseyite | Pb9Sb8S21 |
| 2.HC.10d | Rayite | Pb8(Ag,Tl)2Sb8S21 |
| 2.HC.10c | Heteromorphite | Pb7Sb8S19 |
| 2.HC.10b | Plagionite | Pb5Sb8S17 |
| 2.HC.15 | Falkmanite | Pb3Sb2S6 |
| 2.HC.15 | Boulangerite | Pb5Sb4S11 |
| 2.HC.20 | Robinsonite | Pb4Sb6S13 |
| 2.HC.25 | Moëloite | Pb6Sb6S14(S3) |
| 2.HC.30 | Dadsonite | Pb23Sb25S60Cl |
| 2.HC.35 | Zoubekite | AgPb4Sb4S10 |
| 2.HC.35 | Proto-owyheeite | Ag9Pb40Sb45S112 |
| 2.HC.35 | Owyheeite | Ag3Pb10Sb11S28 |
| 2.HC.50 | Lopatkaite | Pb5Sb3AsS11 |
Other Information
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 Parasterryite
mindat.org URL:
https://www.mindat.org/min-40289.html
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References for Parasterryite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2010) New minerals and nomenclature modifications approved in 2010, CNMNC Newsletter No 5. Mineralogical Magazine, 74 (5) 859-862 doi:10.1180/s0026461x00056887
Moëlo, Y., Orlandi, P., Guillot-Deudon, C., Biagioni, C., Paar, W., Evain, M. (2011) LEAD-ANTIMONY SULFOSALTS FROM TUSCANY (ITALY). XI. THE NEW MINERAL SPECIES PARASTERRYITE, Ag4Pb20(Sb14.5As9.5) 24S58, AND ASSOCIATED STERRYITE, Cu(Ag,Cu)3Pb19(Sb,As)22(As-As)S56, FROM THE POLLONE MINE, TUSCANY, ITALY. The Canadian Mineralogist, 49 (2). 623-638 doi:10.3749/canmin.49.2.623
Moëlo, Yves, Guillot-Deudon, Catherine, Evain, Michel, Orlandi, Paolo, Biagioni, Cristian (2012) Comparative modular analysis of two complex sulfosalt structures: sterryite, Cu(Ag,Cu)3Pb19(Sb,As)22(As–As)S56, and parasterryite, Ag4Pb20(Sb,As)24S58. Acta Crystallographica Section B Structural Science, 68 (5) 480-492 doi:10.1107/s0108768112034027
Localities for Parasterryite
Showing 1 localities.
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).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Williams et al. (2010) +4 other references |
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The
Pollone Mine, Valdicastello Carducci, Pietrasanta, Lucca Province, Tuscany, Italy