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Parasterryite

A valid IMA mineral species
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About ParasterryiteHide

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.


Unique IdentifiersHide

Mindat ID:
40289
Long-form identifier:
mindat:1:1:40289:7

IMA Classification of ParasterryiteHide

Classification of ParasterryiteHide

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
3.5.12.2

3 : SULFOSALTS
5 : 2.5 < ø < 3

Mineral SymbolsHide

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

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

Physical Properties of ParasterryiteHide

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 ParasterryiteHide

Anisotropism:
Distinct in air, strong in oil. Greenish and brownish tints.
Bireflectance:
Distinct
Reflectivity:
WavelengthR1 (%)R2 (%)imR1 (%)imR2 (%)
400nm32.6% 37.8% 19.8% 20.5%
420nm35.0% 40.2% 18.0% 21.1%
440nm34.5% 40.2% 18.9% 21.6%
460nm35.1% 40.9% 19.3% 22.1%
470nm35.1% 40.8% 19.4% 22.2%
480nm34.8% 40.8% 19.6% 22.3%
500nm34.3% 40.1% 19.5% 22.1%
520nm33.6% 39.7% 19.5% 22.0%
540nm33.7% 39.6% 19.4% 21.8%
546nm33.5% 39.3% 19.3% 21.7%
560nm33.3% 39.0% 19.0% 21.6%
580nm32.9% 38.7% 18.8% 21.5%
589nm32.7% 38.2% 18.7% 21.1%
600nm32.5% 38.0% 18.3% 20.9%
620nm32.3% 37.5% 18.0% 20.4%
640nm31.6% 36.4% 17.5% 19.8%
650nm31.4% 36.5% 17.3% 19.5%
660nm31.3% 36.3% 17.0% 19.3%
680nm30.8% 35.4% 16.3% 18.5%
700nm30.4% 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 ParasterryiteHide

Mindat Formula:
Ag4Pb20Sb14As10S58
Element Weights:
Element% weight
Pb46.619 %
S20.922 %
Sb19.177 %
As8.429 %
Ag4.854 %

Calculated from ideal end-member formula.

Crystallography of ParasterryiteHide

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)°
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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0019483ParasterryiteMoelo 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 480-4922012Pollone mine, Tuscany, Italy0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Geological EnvironmentHide

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

Type Occurrence of ParasterryiteHide

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.
Associated Minerals at Type Locality:

Other Language Names for ParasterryiteHide

Relationship of Parasterryite to other SpeciesHide

Member of:
Other Members of Sterryite Group:
CiriottiiteCu(Cu,Ag)3Pb19(Sb,As)22(As2)S56Mon. 2/m
HayyaniteCu5Ag11Pb76Sb71As17(As2+)8S224Mon. 2/m : P21/b
SterryiteCu(Ag,Cu)3Pb19(Sb,As)22(As2)S56Mon. 2/m

Related Minerals - Strunz-mindat GroupingHide

2.HC.BernarlottiitePb6(As5Sb3)S18Tric. 1 : P1
2.HC.HuntingdonitePb19Sb16As6S51Cl2Tric. 1 : P1
2.HC.MoiraitePb12Sb8As8S36Tric. 1 : P1
2.HC.05fParapierrotiteTlSb5S8Mon. m
2.HC.05gMarumoitePb32As40S92Mon. 2 : P21
2.HC.05bBaumhauerite II
2.HC.05dRathiteAg2Pb12-xTlx/2As18+x/2S40Mon. 2/m : P21/b
2.HC.05eHeptasartoriteTl7Pb22As55S108Mon. 2/m : P21/b
2.HC.05dDufrénoysitePb2As2S5Mon. 2 : P21
2.HC.05eHendekasartoriteTl2Pb48As82S172Mon. 2/m : P21/b
2.HC.05bArgentobaumhaueriteAg1.5Pb22As33.5S72Tric. 1 : P1
2.HC.05cArgentoliveingiteAg3+xPb36-2xAs51+xS112Tric. 1 : P1
2.HC.05bBaumhaueritePb12As16S36Tric. 1 : P1
2.HC.05dVeenitePb16Sb9-xAs7+xS40, x ~ 0-0.5Mon. 2 : P21
2.HC.05eDekatriasartoriteTlPb58As97S204Mon. 2/m : P21/b
2.HC.05aHyršlitePb8As10Sb6S32Mon. 2 : P21
2.HC.05eIncomsartoriteTl6Pb144As246S516Mon. 2/m
2.HC.05cLiveingitePb20As24S56Mon. 2 : P21
2.HC.05cJohnjamboritePb14Sb8.5As7.5S38Tric. 1 : P1
2.HC.05fPierrotiteTl2(Sb,As)10S16Orth. mm2 : Pna21
2.HC.05dRathite-IVPbAs2S4
2.HC.05dArgentodufrénoysiteAg3Pb26As35S80Tric. 1 : P1
2.HC.05eÉcrinsiteAgTl3Pb4As11Sb9S36Tric. 1 : P1
2.HC.05aSartoritePbAs2S4Mon. 2/m : P21/m
2.HC.05aTwinnite Pb0.8Tl0.1Sb1.3As0.8S4Mon. 2/m
2.HC.05fPhilrothiteTlAs3S5Mon. 2/m : P21/b
2.HC.05hPolloneiteAgPb46As26Sb23S120Mon. 2 : P21
2.HC.05aGuettarditePb8(Sb0.56As0.44)16S32Mon. 2/m : P21/b
2.HC.10aFülöppitePb3Sb8S15Mon. 2/m : B2/b
2.HC.10dSemseyitePb9Sb8S21Mon. 2/m : B2/b
2.HC.10dRayitePb8(Ag,Tl)2Sb8S21Mon.
2.HC.10cHeteromorphitePb7Sb8S19Mon. 2/m : B2/b
2.HC.10bPlagionitePb5Sb8S17Mon. 2/m : B2/b
2.HC.15FalkmanitePb3Sb2S6Mon.
2.HC.15BoulangeritePb5Sb4S11Mon. 2/m : P21/b
2.HC.20RobinsonitePb4Sb6S13Mon. 2/m : P21/m
2.HC.25MoëloitePb6Sb6S14(S3)Orth. 222 : P21212
2.HC.30DadsonitePb23Sb25S60ClTric. 1 : P1
2.HC.35ZoubekiteAgPb4Sb4S10Orth.
2.HC.35Proto-owyheeiteAg9Pb40Sb45S112Mon. 2/m : P21/b
2.HC.35OwyheeiteAg3Pb10Sb11S28Mon. 2/m
2.HC.50LopatkaitePb5Sb3AsS11Mon. 2/m : P21/b

Other InformationHide

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 ParasterryiteHide

References for ParasterryiteHide

Localities for ParasterryiteHide

Showing 1 localities.

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.
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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.
Italy (TL)
 
  • Tuscany
    • Lucca Province
      • Pietrasanta
        • Valdicastello Carducci
Williams et al. (2010) +4 other references
 
and/or  
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