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Oscarkempffite

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Formula:
Ag10Pb4(Sb17Bi9)S48
Colour:
Greyish black
Lustre:
Metallic
Hardness:
3 - 3½
Specific Gravity:
5.8 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honour of Oscar Kempff Bacigalupo, Bolivian engineering geologist.
Lillianite homologue with N = 4. Chemically similar to clino-oscarkempffite, and somewhat to borodaevite and terrywallaceite.

Found in old material (1929-1930).



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Classification of OscarkempffiteHide

Approved
Approval Year:
2011
First Published:
2016

Physical Properties of OscarkempffiteHide

Metallic
Transparency:
Opaque
Colour:
Greyish black
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN100=189 - 208 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Without any discernible cleavage
Density:
5.8 g/cm3 (Calculated)

Optical Data of OscarkempffiteHide

Type:
Anisotropic
Anisotropism:
grey rotation tints
Reflectivity:
; 38.6 & 41.7 (546 ); 38.1 & 41.2 (589 ); 37.3 & 40.6 (650 )nmR=9.9 & 42.6 (470 nm%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 9.9 & 42.6 (470 nm%.
Colour in reflected light:
Grayish white
Internal Reflections:
not present
Pleochroism:
Visible
Comments:
White to dark grey

Chemical Properties of OscarkempffiteHide

Formula:
Ag10Pb4(Sb17Bi9)S48
Common Impurities:
Cu

Crystallography of OscarkempffiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 13.199(2) Å, b = 19.332(3) Å, c = 8.294(1) Å
Ratio:
a:b:c = 0.683 : 1 : 0.429
Unit Cell V:
2,116.32 ų (Calculated from Unit Cell)
Morphology:
Anhedral grains; grain aggregates up to 10 mm.
Comment:
Space group: Pnca

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.354(100)
2.988(40)
2.889(80)
2.263(40)
2.066(60)
1.766(50)

Type Occurrence of OscarkempffiteHide

General Appearance of Type Material:
Found in old material (1929-30), as anhedral grains, and grain aggregates up to 10 mm across-
Place of Conservation of Type Material:
Department of Materials Engineering and Physics, University of Salzburg, Salzburg,Austria, specimen number 15000, and the Natural History Museum, London, United Kingdom, specimen number BM 20, 3
Associated Minerals at Type Locality:

Synonyms of OscarkempffiteHide

Other Language Names for OscarkempffiteHide

Relationship of Oscarkempffite to other SpeciesHide

Other Members of this group:
Andorite IVPb18Ag15Sb47S96Mon. 2 : P2
Andorite VIAgPbSb3S6Orth. mm2 : Pmn21
AndreadiniiteCuHgAg7Pb7Sb24S48Mon. 2/m : P21/b
ArsenquatrandoriteAg17.6Pb12.8Sb38.1As11.5S96Mon. 2/m : P21/b
AschamalmitePb6Bi2S9Mon. 2/m
Clino-oscarkempffiteAg15Pb6Sb21Bi18S72Mon. 2/m : P21/b
ErzwiesiteAg8Pb12Bi16S40Orth. mmm (2/m 2/m 2/m) : Pbcn
EskimoiteAg7Pb10Bi15S36Mon.
FizélyiteAg5Pb14Sb21S48 Mon. 2/m
GustaviteAgPbBi3S6Orth. mmm (2/m 2/m 2/m)
HeyrovskýitePb6Bi2S9Orth. mmm (2/m 2/m 2/m) : Cccm
JasrouxiteAg16Pb4(Sb24As16)S72Tric. 1 : P1
LillianitePb3-2xAgxBi2+xS6Orth. mmm (2/m 2/m 2/m)
OurayiteAg3Pb4Bi5S13Orth.
OyoniteAg3Mn2Pb4Sb7As4S24Mon. 2/m
RamdohritePb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24Mon. 2/m
RoshchiniteAg19Pb10Sb51S96Orth.
SchirmeritePbAgBi3S6 - Pb3Ag1.5Bi3.5S9Orth.
StaročeskéiteAg0.70Pb1.60(Bi1.35Sb1.35)Σ2.70S6Orth. mmm (2/m 2/m 2/m) : Cmcm
TerrywallaceiteAgPb(Sb,Bi)3S6 Mon. 2/m : P21/b
TreasuriteAg7Pb6Bi15S32Mon.
UchucchacuaiteAgMnPb3Sb5S12Orth. mmm (2/m 2/m 2/m) : Pmmm
UstarasitePb(Bi,Sb)6S10 (?)
VikingiteAg5Pb8Bi13S30Mon. 2/m : B2/m
XilingolitePb3Bi2S6Mon.

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 OscarkempffiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Topa, D., Makovicky, E., Paar, W.H., Stanley, C.J. and Roberts, A.C. (2011): Oscarkempffite, IMA 2011-029. CNMNC Newsletter No. 10, October 2011, page 2555.
Topa, D., Paar, W.H., Makovicky, E., Stanley, C.J., Roberts, A.C. (2016): Oscarkempffite, Ag10Pb4(Sb17Bi9)Σ26S48, a new Sb-Bi member of the lillianite homologous series. Mineralogical Magazine, 80, 809-817

Internet Links for OscarkempffiteHide

Localities for OscarkempffiteHide

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.
Bolivia (TL)
 
  • Potosí Department
    • Sud Chichas Province
      • Atocha-Quechisla District
        • Chocaya-Animas (Animas-Chocaya)
          • Ánimas Mine
            • Colorada vein
Topa, D., Makovicky, E., Paar, W.H., Stanley, C.J. and Roberts, A.C. (2011): Oscarkempffite, IMA 2011-029. CNMNC Newsletter No. 10, October 2011, page 2555; Topa, D., Paar, W.H., Makovicky, E., Stanley, C.J., Roberts, A.C. (2016): Oscarkempffite, Ag10Pb4(Sb17Bi9)Σ26S48, a new Sb-Bi member of the lillianite homologous series. Mineralogical Magazine, 80, 809-817
Mineral and/or Locality  
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