Willyamite Mineral Data

Willyamite Mineral Data +

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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.

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

Diaphaniety:

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:

r_electron=6.22 gm/cc
note: r_Willyamite=7.02 gm/cc.

Fermion Index

Fermion Index = 0.00191
Boson Index = 0.99809

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Willyamite is Not Radioactive

Willyamite Classification

Dana Class:

2.12.3.4 (2)Sulfides - Including Selenides and Tellurides

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

(2.12.3)Cobaltite Group (Cubic or pseudocubic crystals)

2.12.3.1 Cobaltite CoAsS P ca2₁ mm2

2.12.3.2 Gersdorffite NiAsS P 2₁3 2 3

2.12.3.3 Ullmannite NiSbS P 2₁3 2 3

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

2.12.3.5 Tolovkite IrSbS P 2₁3 2 3

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

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

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

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

2.12.3.10 Padmaite PdBiSe P 2₁3 2 3

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

2.12.3.12 Maslovite PtBiTe P 2₁3 2 3

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

2.12.3.14 Changchengite! IrBiS P 2₁3 2 3

2.12.3.15 Milotaite! PdSbSe P 2₁/3 2 3

2.12.3.16 IMA2004-047! PdAsSe Pa3 4/m 2/m 2/m

Strunz Class:

II/D.18-30 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.18 - Cobaltite group, Cobaltite - Ullmannite - Tolovkite series

II/D.18-10 Cobaltite CoAsS P ca2₁ mm2

II/D.18-20 Gersdorffite NiAsS P 2₁3 2 3

II/D.18-25 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

II/D.18-30 Willyamite (Co,Ni)SbS P 2₁3 2 3

II/D.18-40 Ullmannite NiSbS P 2₁3 2 3

II/D.18-50 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

II/D.18-60 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

II/D.18-70 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

II/D.18-80 Tolovkite IrSbS P 2₁3 2 3

Other Willyamite Information

References:

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

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Willyamite

(Co,Ni)SbS
Dana No: 2.12.3.4 Strunz No: II/D.18-30
Locality:

Notes: