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Stillwaterite

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Formula:
Pd8As3
Lustre:
Metallic
Hardness:
Specific Gravity:
10.96 (Calculated)
Crystal System:
Trigonal
Name:
Named after its discovery locality.
Likely polymorphous with arsenopalladinite. One of several Pd arsenide minerals, chemically comparable to isomertieite, Unnamed (Pd Arsenide), etc.


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Classification of StillwateriteHide

Approved
Approval Year:
1974
2.AC.10a

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
C : Alloys of metalloids with PGE
2.16.4.1

2 : SULFIDES
16 : Miscellaneous
3.12.25

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
12 : Sulphides etc. of the platinum metals

Pronounciation of StillwateriteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of StillwateriteHide

Metallic
Hardness:
4½ on Mohs scale
Hardness:
VHN50=384 kg/mm2 - Vickers
Density:
10.96 g/cm3 (Calculated)

Optical Data of StillwateriteHide

Type:
Anisotropic
Anisotropism:
weak (air; dark gray to brownish gray), distinct (oil, brownish black with a blue to yellow-brown tinge)
Reflectivity:
470nmR1=51.6%R2=52.7%
546nmR1=52.5%R2=53.2%
589nmR1=53.1%R2=53.7%
650nmR1=54.4%R2=55.0%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 55.0%.
R1 shown in black, R2 shown in red
Colour in reflected light:
pale creamy gray with faint pinkish tint

Chemical Properties of StillwateriteHide

Formula:
Pd8As3

Crystallography of StillwateriteHide

Crystal System:
Trigonal
Cell Parameters:
a = 7.42 Å, c = 10.31 Å
Ratio:
a:c = 1 : 1.389
Unit Cell V:
491.58 ų (Calculated from Unit Cell)
Twinning:
rare
Comment:
Space group is P3 or P-3

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.115 (100)
2.355 (80)
1.351 (50)
0.8858 (40)
2.700 (30)
1.991 (30)
2.521 (20)

Type Occurrence of StillwateriteHide

General Appearance of Type Material:
anhedral grains up to 265 µm
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Canada (no. M33559); The Natural History Museum, London, England (no. 1979,129); National Museum of Natural History, Washington, D.C.,
USA (no. 132500)
Geological Setting of Type Material:
layered ultramafic igneous complexes (Stillwater complex: Banded and Upper zones)
Associated Minerals at Type Locality:

Synonyms of StillwateriteHide

Other Language Names for StillwateriteHide

Related Minerals - Nickel-Strunz GroupingHide

2.AC.05aAtheneitePd2As0.75Hg0.25Hex. 6 m2 : P62m
2.AC.05bVincentitePd3AsTet.
2.AC.10cArsenopalladinitePd8(As,Sb)3Tric. 1 : P1
2.AC.10bMertieite-IIPd8Sb2.5As0.5Trig.
2.AC.15aIsomertieitePd11Sb2As2Iso. m3m (4/m 3 2/m) : Fd3m
2.AC.15bMertieite-IPd11(Sb,As)4Hex.
2.AC.15aMiessiitePd11Te2Se2Iso. m3m (4/m 3 2/m) : Fd3m
2.AC.20bPalarstanidePd5(Sn,As)2Hex.
2.AC.20aStibiopalladinitePd5Sb2Hex.
2.AC.20cMenshikovitePd3Ni2As3Hex. 6/m : P63/m
2.AC.25eMajakitePdNiAsHex.
2.AC.25aPalladoarsenidePd2AsMon. 2/m : P2/m
2.AC.25fPalladobismutharsenidePd2(As,Bi)Orth.
2.AC.25cPalladodymite(Pd,Rh)2AsOrth.
2.AC.25bRhodarsenide(Rh,Pd)2AsOrth.
2.AC.25dNaldrettitePd2SbOrth. mm2 : Cmc21
2.AC.30UM1999-02-As:NiRh(Rh,Ni)7As4
2.AC.30PolkanoviteRh12As7Hex.
2.AC.35aGenkinite(Pt,Pd,Rh)4Sb3Tet. 4 2 2
2.AC.35bUngavaitePd4Sb3Tet. 4 2 2 : P41 21 2
2.AC.40PolaritePd(Bi,Pb)Orth. mm2 : Cmc21
2.AC.45cBorishanskiitePd1+x(As,Pb)2 , x = 0-0.2Orth. mm2
2.AC.45aFrooditeα-PdBi2Mon. 2/m : B2/m
2.AC.45bIridarsenite(Ir,Ru)As2Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.12.1Seinäjokite(Fe,Ni)(Sb,As)2Orth.
3.12.2LauriteRuS2Iso. m3 (2/m 3) : Pa3
3.12.3Ruthenarsenite(Ru,Ni)AsOrth.
3.12.4Anduoite(Ru,Os)As2Orth.
3.12.5Ruarsite(Ru,Os)AsSMon.
3.12.6Xingzhongite(Pb,Cu,Fe)(Ir,Pt,Rh)2S4Iso.
3.12.7RhodplumsiteRh3Pb2S2Trig.
3.12.8Cuprorhodsite(Cu,Fe)Rh2S4Iso. m3m (4/m 3 2/m) : Fd3m
3.12.9KonderiteCu3Pb(Rh,Pt,Ir)8S16Hex. 6/m : P6/m
3.12.10Bowieite(Rh,Ir,Pt)2S3Orth. mmm (2/m 2/m 2/m)
3.12.11CherepanoviteRhAsOrth. mmm (2/m 2/m 2/m) : Pnma
3.12.12Hollingworthite(Rh,Pt,Pd)AsSIso. m3 (2/m 3)
3.12.13Vysotskite(Pd,Ni)STet.
3.12.14Vasilite(Pd,Cu)16(S,Te)7
3.12.15PalladseitePd17Se15
3.12.16Oosterboschite(Pd,Cu)7Se5Orth.
3.12.17TelluropalladinitePd9Te4Mon.
3.12.18TemagamitePd3HgTe3Trig. 3m : P3m1
3.12.19SopcheiteAg4Pd3Te4Orth.
3.12.20MicheneritePdBiTe
3.12.21KotulskitePd(Te,Bi)Hex.
3.12.22Telargpalite(Pd,Ag)3(Te,Bi)Iso.
3.12.23Merenskyite(Pd,Pt)(Te,Bi)2Trig. 3m : P3m1
3.12.24PalladoarsenidePd2AsMon. 2/m : P2/m
3.12.26AtheneitePd2As0.75Hg0.25Hex. 6 m2 : P62m
3.12.27MajakitePdNiAsHex.
3.12.28PalarstanidePd5(Sn,As)2Hex.
3.12.29ArsenopalladinitePd8(As,Sb)3Tric. 1 : P1
3.12.30VincentitePd3AsTet.
3.12.31PalladobismutharsenidePd2(As,Bi)Orth.
3.12.32StibiopalladinitePd5Sb2Hex.
3.12.33Hexatestibiopanickelite(Pd,Ni)(Sb,Te)Hex.
3.12.34Sudburyite(Pd,Ni)SbHex.
3.12.35TestibiopalladitePdTe(Sb,Te)Iso.
3.12.36BorovskitePd3SbTe4Iso.
3.12.37IsomertieitePd11Sb2As2Iso. m3m (4/m 3 2/m) : Fd3m
3.12.38Mertieite-IPd11(Sb,As)4Hex.
3.12.39Mertieite-IIPd8Sb2.5As0.5Trig.
3.12.40SobolevskitePd(Bi,Te)Hex.
3.12.41Frooditeα-PdBi2Mon. 2/m : B2/m
3.12.42PolaritePd(Bi,Pb)Orth. mm2 : Cmc21
3.12.43UrvantsevitePd(Bi,Pb)2Tet.
3.12.44CooperitePtSTet. 4/mmm (4/m 2/m 2/m) : P42/mmc
3.12.45Braggite(Pt,Pd,Ni)STet.
3.12.46Kharaelakhite(Cu,Pt,Pb,Fe,Ni)9S8Orth. mmm (2/m 2/m 2/m) : Pmmm
3.12.47MalaniteCu(Pt3+,Ir3+)2S4Iso.
3.12.48Moncheite(Pt,Pd)(Te,Bi)2Trig.
3.12.49MaslovitePtBiTe
3.12.50SperrylitePtAs2Iso. m3 (2/m 3) : Pa3
3.12.51PlatarsitePtAsSIso.
3.12.52GeversitePtSb2Iso. m3 (2/m 3) : Pa3
3.12.53DaomaniteCuPtAsS2Orth.
3.12.54Genkinite(Pt,Pd,Rh)4Sb3Tet. 4 2 2
3.12.55StumpflitePt(Sb,Bi)Hex.
3.12.56InsizwaitePt(Bi,Sb)2
3.12.57ErlichmaniteOsS2Iso. m3 (2/m 3) : Pa3
3.12.58Omeiite(Os,Ru)As2Orth.
3.12.59Osarsite(Os,Ru)AsSMon.
3.12.60Kashinite(Ir,Rh)2S3Orth.
3.12.61InaglyiteCu3Pb(Ir,Pt)8S16Hex.
3.12.62Cuproiridsite(Cu,Fe)Ir2S4Iso. m3m (4/m 3 2/m) : Fd3m
3.12.63Iridarsenite(Ir,Ru)As2Mon.
3.12.64Irarsite(Ir,Ru,Rh,Pt)AsSIso.
3.12.65TolovkiteIrSbSIso.

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 StillwateriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cabri, L.J., Laflamme, J.H.G., Stewart, J.M., Rowland, J.F., Chen, T.T. (1975) New data on some palladium arsenides and antimonides. Canadian Mineralogist, 13, 321-335.
Fleischer, M., Pabst, A., Mandarino, J.A., Chao, G.Y. (1977) New Mineral Names. American Mineralogist, 62, 1057-1061.
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for StillwateriteHide

Localities for StillwateriteHide

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.
Canada
 
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
Canadian Mineralogist 45, 775; Grammatikopoulos, T.A., Hiebert, R.S., Barr, S.M. and Valeyev, O., (2006) Cu-Ni-PGM Mineralization In The Mechanic Settlement Pluton, Southern New Brunswick, Canada. in Geological Association of Canada, Program with Abstracts Volume 31
  • Ontario
    • Thunder Bay District
      • Coldwell complex
Mcdonald, A.M., Cabri, L.J., Stanley, C.J., Good, D.J., Redpath, J., Lane, G., Spratt, J. & Ames, D.E. (2015) Coldwellite, Pd3Ag2S, a new mineral species from the Marathon deposit, Coldwell complex, Ontario, Canada. Canadian Mineralogist 53, 1-13.
      • Lac des Iles Area
Canadian Mineralogist 22:233-237; Louis J. Cabri and J.H. Gilles Laflamme (1979) Mineralogy of Samples from the Lac Des Iles Area, Ontario. Canmet Report 79-27
Canadian Mineralogist, Vol.22, pp. 125-136 (1984); D. H. Watkinson and G. Dunning v(1979) Geology and platinum-group mineralization, Lac-des-Iles Complex, northwestern Ontario. Can Mineral 17:453-462
      • Seeley Lake Area
EcoMetrix Reort for Stillwater Canada Inc, Marathon Project (2012) Table 4.1-3
Finland
 
Törnroos Ragnar, Johanson Bo, Kojonen Kari, 1998. Alluvial nuggets of platinum group minerals and alloys from Finnish Lapland. Geological survey of Finland, Special Paper
    • Inari
      • Lemmenjoki
33rd International Geological Congress (2008) session MPM-04 Platinum-group mineralogy: Pt-Pd selenides from river placers, northern Finland; Kojonen, K. K., Tarkian, M., Roberts, A. C., Törnroos, R., & Heidrich, S. (2007). Miessiite, Pd11Te2Se2, a new mineral species from Miessijoki, Finnish Lapland, Finland. The Canadian Mineralogist, 45(5), 1221-1227.; Kari Kojonen (2012) PGE ore potential in the southwestern granulite belt of Northern Finland. Geological Survey of Finland, Report of Investigation 207 pp 64-67
Kojonen, K., Tarkian, M., Heidrich, S. & Johanson, B. (2014) Placer Platinum-group Minerals from Sotajoki River, Inari, Finland. 12th International Platinum Symposium p259
    • Portimo complex
Iljina, M. 1994. The Portimo Layered Igneous Complex - with emphasis on diverse sulphide and platinum-group element deposits. Acta Univ. Oul. A258, 1994
Norway
 
  • Finnmark
    • Porsanger
Nilsson, L. P. & Larsen, R. B. (1998): Edle mineraler i mafiske og ultramafiske bergarter- en oppsummering av platina-gruppe mineraler (PGM) funnet i Norge i de senere år. Norsk Bergverksmuseum Skrift 14: 40-49
Russia
 
  • Northern Region
    • Karelia Republic
      • Northern Karelia
        • Oulanka plutonic complex
          • Olanga River (Oulanka River)
Grishaenko, M. V. P., & Federation, R. (2007). Independent Report on the Shalozerskoe (Burakovsky), Lukkulaisvaara and Tsipringa Platinum, Palladium, Copper, Nickel Deposits in the Autonomous Republic of Karelia Russian Federation
    • Murmanskaya Oblast'
      • Fedorovo-Pansky massif (Pana layered complex)
33rd International Geological Congress (2008) session MPM-04 Platinum-group mineralogy: Platinum-group minerals in the PGE deposit of the Fedorovo-Pansky layered intrusion, Kola Peninsula
33rd International Geological Congress (2008) session MPM-04 Platinum-group mineralogy: Platinum-group minerals in the PGE deposit of the Fedorovo-Pansky layered intrusion, Kola Peninsula
33rd International Geological Congress (2008) session MPM-04 Platinum-group mineralogy: Platinum-group minerals in the PGE deposit of the Fedorovo-Pansky layered intrusion, Kola Peninsula
      • Monche-Tundra
        • Monchegorsk
33 IGC excursion No 48, August 15 – 21, 2008
South Africa
 
  • Limpopo Province
    • Bushveld Complex
The Canadian Mineralogist Vol. 43, pp. 1711-1734 (2005)
      • Waterberg District
        • Mokopane (Potgietersrus)
Holwell, D. A., McDonald, I., & Armitage, P. E. B. (2006). Platinum-group mineral assemblages in the Platreef at the Sandsloot Mine, northern Bushveld Complex, South Africa. Mineralogical Magazine, 70(1), 83-101.; HOLWELL D.A., MCDONALD I. & ARMITAGE, P.E.B. (2006). Platinum-group mineral assemblages in the Platreef at the South Central Pit, Sandsloot Mine, northern Bushveld Complex, South Africa. Mineralogical Magazine, 70, 83-101.
USA (TL)
 
  • Montana
    • Stillwater Co.
      • Nye
Canadian Mineralogist (1975) 13:321-335; Canadian Mineralogist Vol.24, pp. 329-346 (1986)
          • Blakely Creek
Canadian Mineralogist Vol.24, pp. 329-346 (1986)
Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240.
Mineral and/or Locality  
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