Willyamite Mineral Data

General Willyamite Information

Chemical Formula:

(Co,Ni)SbS

Composition:

Molecular Weight = 212.69 gm

Cobalt 20.78 % Co

Nickel 6.90 % Ni

Antimony 57.24 % Sb

Sulfur 15.08 % S

______

100.00 %

Empirical Formula:

Co_0.75Ni_0.25SbS

Environment:

In calcite-siderite veins. Forms a series with ullmannite.

IMA Status:

Valid Species (Pre-IMA) 1896

Locality:

A.B.H. Consols mine, Broken Hill, Willyama Township, New South Wales, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Willyamite + Pronunciation

Willyamite Image

Images:

Willyamite

Comments: Gray granular massive willyamite.
Location: Consols Lode, Broken Hill, Willyama Township, New South Wales, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Willyamite Crystallography

Cell Dimensions:

a = 5.86, Z = 4; V = 201.23 Den(Calc)= 7.02

Crystal System:

Isometric - TetartoidalH-M Symbol (2 3) Space Group: P 2₁3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.621(1), 2.39(0.7), 1.767(0.6),

Physical Properties of Willyamite

Cleavage:

{001} Perfect

Color:

Steel gray, Silver white.

Density:

6.76

Diaphaneity:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

5.5 - Knife Blade

Luster:

Metallic

Streak:

grayish black

Calculated Properties of Willyamite

Electron Density:

Bulk Density (Electron Density)=6.22 gm/cc
note: Specific Gravity of Willyamite =7.02 gm/cc.

Fermion Index:

Fermion Index = 0.0019102793
Boson Index = 0.9980897207

Photoelectric:

PE_Willyamite= 201.45 barns/electron
U=PE_Willyamite x rElectron Density=1,253.33 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Willyamite is Not Radioactive

Willyamite Classification

Dana Class:

02.12.03.04 (02)Sulfides - Including Selenides and Tellurides

(02.12)where Am Bn Xp, with (m+n):p=1:2

(02.12.03)Cobaltite Group (Cubic or pseudocubic crystals)

02.12.03.01 Cobaltite CoAsS P ca2₁ mm2

02.12.03.02 Gersdorffite NiAsS P 2₁3 2 3

02.12.03.03 Ullmannite NiSbS P 2₁3 2 3

02.12.03.04 Willyamite (Co,Ni)SbS P 2₁3 2 3

02.12.03.05 Tolovkite IrSbS P 2₁3 2 3

02.12.03.06 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

02.12.03.07 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

02.12.03.08 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

02.12.03.09 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

02.12.03.10 Padmaite PdBiSe P 2₁3 2 3

02.12.03.11 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

02.12.03.12 Maslovite PtBiTe P 2₁3 2 3

02.12.03.13 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

02.12.03.14 Changchengite! IrBiS P 2₁3 2 3

02.12.03.15 Milotaite! PdSbSe P 2₁/3 2 3

02.12.03.16 Kalungaite! PdAsSe Pa3 2/m 3

Strunz Class:

02.EB.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.E - Metal Sulfides, M:S £ 1:2

02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.

02.EB.25 Cobaltite CoAsS P ca2₁ mm2

02.EB.25 Changchengite! IrBiS P 2₁3 2 3

02.EB.25 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

02.EB.25 Gersdorffite NiAsS P 2₁3 2 3

02.EB.25 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

02.EB.25 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

02.EB.25 Krutovite NiAs2 P a3 2/m 3

02.EB.25 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

02.EB.25 Maslovite PtBiTe P 2₁3 2 3

02.EB.25 Mayingite IrBiTe P a3 2/m 3

02.EB.25 Padmaite PdBiSe P 2₁3 2 3

02.EB.25 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

02.EB.25 Ullmannite NiSbS P 2₁3 2 3

02.EB.25 Tolovkite IrSbS P 2₁3 2 3

02.EB.25 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

02.EB.25 Willyamite (Co,Ni)SbS P 2₁3 2 3

02.EB.25 Kalungaite! PdAsSe Pa3 2/m 3

02.EB.25 Milotaite! PdSbSe P 2₁/3 2 3

Other Willyamite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Willyamite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Willyamite Specimen Label here :

Willyamite

(Co,Ni)SbS
Dana No: 02.12.03.04 Strunz No: 02.EB.25
Locality:

Notes: