Willyamite
A valid IMA mineral species - grandfathered
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About Willyamite
Formula:
CoSbS
May contain variable amounts of Ni substituting for Co.
Colour:
Tin-white, steel-gray
Lustre:
Metallic
Hardness:
5 - 5½
Specific Gravity:
6.76
Member of:
Name:
For the type locality, Willyama Township, New South Wales, Australia.
Unique Identifiers
Mindat ID:
4295
Long-form identifier:
mindat:1:1:4295:2
GUID
(UUID V4):
(UUID V4):
b8f012f2-7677-40c6-92c2-fe501f707dbf
IMA Classification of Willyamite
Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Redefined by the IMA
First published:
1893
Classification of Willyamite
2.EB.25
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
2.12.3.4
2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.11.39
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
11 : Sulphides etc. of Ni
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
11 : Sulphides etc. of Ni
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Wly | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Willyamite
Metallic
Transparency:
Opaque
Colour:
Tin-white, steel-gray
Hardness:
5 - 5½ on Mohs scale
Comment:
Slightly harder than ullmannite.
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
6.76(3) g/cm3 (Measured)
Chemistry of Willyamite
Mindat Formula:
CoSbS
May contain variable amounts of Ni substituting for Co.
May contain variable amounts of Ni substituting for Co.
Elements listed:
Common Impurities:
Fe,As
Crystallography of Willyamite
Cell Parameters:
a = 5.86 Å
Z:
4
Morphology:
Zoned crystals to several mm.
Comment:
Symmetry and space group unknown, but probably monoclinic or triclinic. Pseudocubic; a ~ b ~ c within error limits.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.621 Ă | (100) |
2.390 Ă | (70) |
1.767 Ă | (60) |
1.565 Ă | (50) |
1.625 Ă | (40) |
1.278 Ă | (40) |
1.087 Ă | (40) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-đ alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Geological Setting:
Calcite - siderite veins.
Type Occurrence of Willyamite
General Appearance of Type Material:
Crystals several mm on a side, showing zonal growth patterns.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, R849A.
Associated Minerals at Type Locality:
Reference:
Cabri, L.J., Harris, D.C., Stewart, J.M., Rowland, J.F. (1970): Willyamite redefined. Proceedings of the Australasian Institute of Mining and Metallurgy 233, 95-100.
Other Language Names for Willyamite
Relationship of Willyamite to other Species
Member of:
Other Members of this group:
Andrieslombaardite | RhSbS | Iso. 2 3 : P21 3 |
Changchengite | IrBiS | Iso. 2 3 : P21 3 |
Cobaltite | CoAsS | Orth. mm2 : Pca21 |
Gersdorffite | NiAsS | Iso. m3 (2/m 3) : Pa3 |
Hollingworthite | (Rh,Pt,Pd)AsS | Iso. m3 (2/m 3) : Pa3 |
Irarsite | (Ir,Ru,Rh,Pt)AsS | Iso. m3 (2/m 3) : Pa3 |
Jolliffeite | NiAsSe | Iso. m3 (2/m 3) : Pa3 |
Kalungaite | PdAsSe | Iso. m3 (2/m 3) : Pa3 |
Maslovite | PtBiTe | Iso. 2 3 : P21 3 |
Mayingite | IrBiTe | Iso. m3 (2/m 3) : Pa3 |
Michenerite | PdBiTe | Iso. 2 3 : P21 3 |
Milotaite | PdSbSe | Iso. 2 3 : P21 3 |
Padmaite | PdBiSe | Iso. 4 3 2 |
Platarsite | Pt(As,S)2 | Iso. m3 (2/m 3) : Pa3 |
Testibiopalladite | PdSbTe | Iso. |
Tolovkite | IrSbS | Iso. |
Ullmannite | NiSbS | Iso. 2 3 : P21 3 |
UM1991-19-Se:AsCo | (Co,Ni)AsSe | Iso. m3 (2/m 3) : Pm3 |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
4 photos of Willyamite associated with Quartz | SiO2 |
3 photos of Willyamite associated with Galena | PbS |
2 photos of Willyamite associated with Chalcopyrite | CuFeS2 |
2 photos of Willyamite associated with Sphalerite | ZnS |
1 photo of Willyamite associated with Ullmannite | NiSbS |
1 photo of Willyamite associated with Siderite | FeCO3 |
Related Minerals - Strunz-mindat Grouping
2.EB. | Iridarsenite | (Ir,Ru)As2 |
2.EB. | Selenolaurite | RuSe2 |
2.EB. | Andrieslombaardite | RhSbS |
2.EB. | Kanatzidisite | (SbBiS3)2Te2 |
2.EB.05a | Aurostibite | AuSb2 |
2.EB.05b | Bambollaite | Cu(Se,Te)2 |
2.EB.05a | Cattierite | CoS2 |
2.EB.05a | Erlichmanite | OsS2 |
2.EB.05a | Fukuchilite | Cu3FeS8 |
2.EB.05a | Geversite | PtSb2 |
2.EB.05a | Hauerite | MnS2 |
2.EB.05a | Insizwaite | Pt(Bi,Sb)2 |
2.EB.05a | Krut'aite | CuSe2 |
2.EB.05a | Laurite | RuS2 |
2.EB.05a | Penroseite | (Ni,Co,Cu)Se2 |
2.EB.05a | Pyrite | FeS2 |
2.EB.05a | Sperrylite | PtAs2 |
2.EB.05a | Trogtalite | CoSe2 |
2.EB.05a | Vaesite | NiS2 |
2.EB.05a | VillamanĂnite | (Cu,Ni,Co,Fe)S2 |
2.EB.05a | Dzharkenite | FeSe2 |
2.EB.05a | Gaotaiite | Ir3Te8 |
2.EB.05a v | Cayeuxite | |
2.EB.10b | Alloclasite | Co1-xFexAsS |
2.EB.10d | Costibite | CoSbS |
2.EB.10a | Ferroselite | FeSe2 |
2.EB.10a | Frohbergite | FeTe2 |
2.EB.10c | Glaucodot | (Co0.50Fe0.50)AsS |
2.EB.10a | Kullerudite | NiSe2 |
2.EB.10a | Marcasite | FeS2 |
2.EB.10a | Mattagamite | CoTe2 |
2.EB.10e | Paracostibite | CoSbS |
2.EB.10e | Pararammelsbergite | NiAs2 |
2.EB.10f | Oenite | CoSbAs |
2.EB.10a | PetĆĂÄekite | CuSe2 |
2.EB.15a | Anduoite | (Ru,Os)As2 |
2.EB.15a | Clinosafflorite | CoAs2 |
2.EB.15a | Löllingite | FeAs2 |
2.EB.15a | Nisbite | NiSb2 |
2.EB.15a | Omeiite | (Os,Ru)As2 |
2.EB.15c | Paxite | CuAs2 |
2.EB.15a | Rammelsbergite | NiAs2 |
2.EB.15a | Safflorite | (Co,Ni,Fe)As2 |
2.EB.15b | SeinÀjokite | (Fe,Ni)(Sb,As)2 |
2.EB.20 | Arsenopyrite | FeAsS |
2.EB.20 | Gudmundite | FeSbS |
2.EB.20 | Osarsite | (Os,Ru)AsS |
2.EB.20 | Ruarsite | (Ru,Os)AsS |
2.EB.25 va | Antimony-bearing Gersdorffite | Ni(As,Sb)S |
2.EB.25 | Cobaltite | CoAsS |
2.EB.25 | Gersdorffite | NiAsS |
2.EB.25 | Hollingworthite | (Rh,Pt,Pd)AsS |
2.EB.25 | Irarsite | (Ir,Ru,Rh,Pt)AsS |
2.EB.25 | Jolliffeite | NiAsSe |
2.EB.25 | Krutovite | NiAs2 |
2.EB.25 | Maslovite | PtBiTe |
2.EB.25 | Michenerite | PdBiTe |
2.EB.25 | Padmaite | PdBiSe |
2.EB.25 | Platarsite | Pt(As,S)2 |
2.EB.25 | Testibiopalladite | PdSbTe |
2.EB.25 | Tolovkite | IrSbS |
2.EB.25 | Ullmannite | NiSbS |
2.EB.25 | Changchengite | IrBiS |
2.EB.25 | Mayingite | IrBiTe |
2.EB.25 | Kalungaite | PdAsSe |
2.EB.25 | Milotaite | PdSbSe |
2.EB.25 | Paragersdorffite | Ni(As,S)2 |
2.EB.25 | Orthogersdorffite | NiAsS |
2.EB.25 | KvaÄekite | NiSbSe |
2.EB.30 | Urvantsevite | Pd(Bi,Pb)2 |
2.EB.35 | Rheniite | ReS2 |
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 Willyamite
mindat.org URL:
https://www.mindat.org/min-4295.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Willyamite
Reference List:
Bayliss, P. (1986) Subdivision of the pyrite group and a chemical and x-ray-diffraction investigation of ullmannite. The Canadian Mineralogist, 24 (1) 27-33
Localities for Willyamite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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.
All localities listed without proper references should be considered as questionable.
Australia | |
| Ramdohr (1950) |
Rocks & Min.:62:224-225. +4 other references | |
Ramdohr (1950) | |
Ramdohr (1950) | |
| Sielecki (1988) |
Austria | |
| Kolitsch et al. (2019) |
| Kolitsch (2020) |
Canada | |
| Marsden (2012) |
| Vollo (1959) |
China | |
| Jingwen Mao et al. (2002) |
Czech Republic | |
| Brabec (2002) |
Finland | |
| Weiser et al. (2008) |
| Eilu (2003) |
Italy | |
| Venerandi Pirri I. (1992) +1 other reference |
| Casari (1986) |
Kazakhstan | |
| Kovalev et al. (2009) +1 other reference |
Norway | |
| Naik +1 other reference |
Russia | |
| Silyanov et al. (2022) |
| Bryzgalov et al. (2007, November) |
| Spiridonov et al. (2010, December) |
Slovakia | |
| MaƄo et al. (stredné Slovensko) |
| KodÄra (1986) |
Ragan M. et al. (veporikum) | |
| KodÄra (1986) |
| Grecula (1995) |
KodÄra (1986) | |
| VarÄek C. (1958) |
Sweden | |
| Nysten et al. (1984) |
| |
| Dobbe (1991) +1 other reference |
Tanzania | |
| Vos (2009) |
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Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia