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Polloneite

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Formula:
AgPb46As26Sb23S120
The formula is simplified after applying the structure analysis
Colour:
greyish-black
Lustre:
Metallic
Hardness:
3 - 3½
Specific Gravity:
5.77 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
After the type locality, the Pollone Mine, Italy.
New member of the sartorite homologous series (N=4). Its Ag content, although small, is important.

The structure is a 3-fold superstructure, where the unit cell parameter (7.9 Å) is tripled. It consists of:
- As-Sb rich slabs
- crankshaft chains (few types)
- isolated (As,Sb)-S polyhedra
There are 3 different broad ribbons consisting of double layer fragments; 2 of them contain 2 asymmetric fragments with long crankshaft chains, while the third fragment type, containing Ag, has small mirror-symmetrical metalloid groups and is devoid of the crankshaft chains. The above is likely a cause of an order-disorder character. The structure is different from that of veenite and dufrénoysite.


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Classification of PolloneiteHide

Approved
Approval Year:
2015
First Published:
2017

Physical Properties of PolloneiteHide

Metallic
Transparency:
Opaque
Colour:
greyish-black
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN50=200 kg/mm2 - Vickers
Comment:
VHN: mean
Density:
5.77 g/cm3 (Calculated)

Optical Data of PolloneiteHide

Type:
Anisotropic
Anisotropism:
Moderate, brown-violet and deep grey rotation tints
Bireflectance:
moderate
Reflectivity:
470nmR1=30.2%R2= 42.4%
546nmR1=28.8%R2= 41.0%
589nmR1=27.9%R2= 39.8%
650nmR1=26.0%R2= 37.4%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 42.4%.
R1 shown in black, R2 shown in red
Colour in reflected light:
white
Internal Reflections:
not present

Chemical Properties of PolloneiteHide

Formula:
AgPb46As26Sb23S120

The formula is simplified after applying the structure analysis

Crystallography of PolloneiteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Setting:
P21
Cell Parameters:
a = 8.413(2) Å, b = 25.901(5) Å, c = 23.817(5) Å
β = 90.01(3)°
Ratio:
a:b:c = 0.325 : 1 : 0.92
Unit Cell V:
5189.8 ų
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.795(100)
3.414(60)
3.238(69)
3.020(97)
2.922(82)
2.738(73)
2.375(79)
2.103(64)
Comments:
from the original paper

Type Occurrence of PolloneiteHide

General Appearance of Type Material:
Anhedral grains, up to 0.5 mm across
Place of Conservation of Type Material:
Type material is deposited in the reference collection of the Naturhistorisches Museum Wien, catalogue number N 9786
Empirical Formula of Type Material:
Ag1.20Pb45.76As25.79Sb23.04S120.21
Chemical Analysis of Type Material:
Ag0.71 %
Pb52.05 %
As10.61 %
Sb15.40 %
S21.16 %
Total:99.93 %
Geological Setting of Type Material:
Baryte–pyrite–(Pb–Zn–Ag) deposit (sits within baryte matrix)
Associated Minerals at Type Locality:
Reference:
Topa, D., Keutsch, F.N., Makovicky, E., Kolitsch, U., Paar, W. (2017): Polloneite, a new complex Pb(-Ag)-As-Sb sulfosalt from the Pollone mine, Apuan Alps, Tuscany, Italy. Mineralogical Magazine: 81: 1303-1322.

Synonyms of PolloneiteHide

Relationship of Polloneite to other SpeciesHide

Member of:
Other Members of this group:
ArgentobaumhaueriteAg1.5Pb22As33.5S72Tric. 1 : P1
ArgentodufrénoysiteAg3Pb26As35S80Tric. 1 : P1
ArgentoliveingiteAgxPb40-2xAs48+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
DufrénoysitePb2As2S5Mon. 2 : P21
ÉcrinsiteAgTl3Pb4As11Sb9S36Tric. 1 : P1
EnneasartoriteTl6Pb32As70S140Mon. 2/m : P21/b
GuettarditePbAsSbS4Mon. 2/m : P21/b
HendekasartoriteTl2Pb48As82S172Mon. 2/m : P21/b
HeptasartoriteTl7Pb22As55S108Mon. 2/m : P21/b
HyršlitePb8As10Sb6S32Mon. 2 : P21
IncomsartoriteTl6Pb144As246S516Mon. 2/m
LiveingitePb9As13S28Mon.
ParapierrotiteTlSb5S8Mon. m
PhilrothiteTlAs3S5Mon. 2/m : P21/b
PierrotiteTl2(Sb,As)10S16Orth. mm2 : Pna21
RathiteAg2Pb12-xTlx/2As18+x/2S40Mon. 2/m : P21/b
SartoritePbAs2S4Mon. 2/m : P21/m
Twinnite Pb0.8Tl0.1Sb1.3As0.8S4Mon. 2/m
VeenitePb2(Sb,As)2S5Mon. 2 : P21

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.

References for PolloneiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Topa, D., Keutsch, F.N., Makovicky, E., Kolitsch, U. and Paar, W. (2015) Polloneite, IMA 2014-093. CNMNC Newsletter No. 24, April 2015, page 249; Mineralogical Magazine, 79, 247-251.
Topa, D., Keutsch, F.N., Makovicky, E., Kolitsch, U., Paar, W. (2017): Polloneite, a new complex Pb(-Ag)-As-Sb sulfosalt from the Pollone mine, Apuan Alps, Tuscany, Italy. Mineralogical Magazine: 81: 1303-1322.

Internet Links for PolloneiteHide

Localities for PolloneiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Pietrasanta
          • Valdicastello Carducci
Topa, D., Keutsch, F.N., Makovicky, E., Kolitsch, U. and Paar, W. (2015) Polloneite, IMA 2014-093. CNMNC Newsletter No. 24, April 2015, page 249; Mineralogical Magazine, 79, 247-251; Topa, D., Keutsch, F.N., Makovicky, E., Kolitsch, U., Paar, W. (2017): Polloneite, a new complex Pb(-Ag)-As-Sb sulfosalt from the Pollone mine, Apuan Alps, Tuscany, Italy. Mineralogical Magazine, 81, 1303-1322.
Mineral and/or Locality  
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