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Physical Properties of Ullmannite
Cleavage:
{100} Good, {010} Good, {001} Good
Color:
Steel gray, Silver white, Tin white.
Density:
6.65
Diaphaneity:
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:
Bulk Density (Electron Density)=6.19 gm/cc note: Specific Gravity of Ullmannite =6.92 gm/cc.
Fermion Index:
Fermion Index = 0.0042525482 Boson Index = 0.9957474518
Photoelectric:
PEUllmannite = 201.24 barns/electron U=PEUllmannite x rElectron Density=1,245.07 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ullmannite is Not Radioactive
Ullmannite Classification
Dana Class:
02.12.03.03(02)Sulfides - Including Selenides and Tellurides
Chemical Formula: 
