Ullmannite Mineral Data

Ullmannite Mineral Data +

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General Ullmannite Information

Chemical Formula:

NiSbS

Composition:

Molecular Weight = 212.51 gm

Nickel 27.62 % Ni

Antimony 57.29 % Sb

Sulfur 15.09 % S

______

100.00 %

Empirical Formula:

NiSbS

Environment:

With Ni minerals in hydrothermal veins. Forms a series with willyamite.

IMA Status:

Valid Species (Pre-IMA) 1843

Locality:

Freusburg, Siegen, Nordrhein-Westfalen, Germany. Link to MinDat.org Location Data.

Name Origin:

Named after the German chemist and mineralogist, J. Ch. Ullmann (1771-1821).

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Ullmannite Crystallography

Cell Dimensions:

a = 5.886, Z = 4; V = 203.92 Den(Calc)= 6.92

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): 2.66(1), 1.78(0.4), 2.41(0.4),

Forms:

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Forms: [ 1 1 1] [ 1 0 0]

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Crystal Structure:

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Bayliss P , American Mineralogist , 62 (1977) p.369-373, Crystal structure refinement of arsenian ullmannite, approximate cubic structure

View Additional jPOWD Structure files for Ullmannite
[1] [2]

Physical Properties of Ullmannite

Cleavage:

[100] Good, [010] Good, [001] Good

Color:

Steel gray, Silver white, Tin white.

Density:

6.65

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5.5 - Knife Blade

Luster:

Metallic

Streak:

grayish black

Optical Properties of Ullmannite

RL Anisotrophism:

Occasionally induviduals are weakly anisotropic revealing a fine lamellar structure.

RL Color:

White.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ullmannite in Air**
λ	R	∑ R(λ)
400 nm	52.00
420 nm	51.00
440 nm	50.00
460 nm	49.00
480 nm	48.20
500 nm	47.40
520 nm	46.70
540 nm	46.10
560 nm	45.70
580 nm	45.50
600 nm	45.50
620 nm	45.60
640 nm	46.00
660 nm	46.40
680 nm	47.00
700 nm	47.60

**Calculated Relative Intensity Colors of Ullmannite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R

Calculated Properties of Ullmannite

Electron Density:

r_electron=6.19 gm/cc
note: r_Ullmannite=6.92 gm/cc.

Fermion Index

Fermion Index = 0.00425
Boson Index = 0.99575

Photoelectric:

PE_Ullmannite= 201.24 barns/electron
U=PE_Ullmannite x r_electron=1,245.07 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ullmannite is Not Radioactive

Ullmannite Classification

Dana Class:

2.12.3.3 (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.18-40 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 Ullmannite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Ullmannite

NiSbS
Dana No: 2.12.3.3 Strunz No: II/D.18-40
Locality:

Notes: