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Physical Properties of Pyrolusite
Cleavage:
{110} Perfect
Color:
Steel gray, Iron gray, Bluish gray.
Density:
4.4 - 5.06, Average = 4.73
Diaphaneity:
Opaque
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite).
Habit:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Habit:
Reniform - "Kidney like" in shape (e.g.. hematite).
Hardness:
6-6.5 - Orthoclase-Pyrite
Luminescence:
Non-fluorescent.
Luster:
Sub Metallic
Magnetism:
Nonmagnetic
Streak:
black
Optical Properties of Pyrolusite
Optical Data:
Uniaxial (?).
NCalc= 3.06 - from Gladstone-Dale relationship (KC = 0.394) where Ncalc=Dcalc*KC+1 NCalc= 2.86 - from Gladstone-Dale relationship (KC = 0.394) where Ncalc=Dmeas*KC+1
RL Anisotrophism:
Strong in yellow.
RL Bireflectance:
Weak, yellow to yellow-gray.
RL Color:
White with creamy yellow tint.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Pyrolusite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
18.40
29.40
420 nm
18.60
30.00
440 nm
18.80
30.60
460 nm
18.90
31.20
480 nm
19.00
31.60
500 nm
19.00
31.70
520 nm
18.90
31.60
540 nm
18.80
31.40
560 nm
18.60
31.20
580 nm
18.50
30.80
600 nm
18.40
30.40
620 nm
18.30
30.00
640 nm
18.20
29.50
660 nm
18.20
28.90
680 nm
18.10
28.40
700 nm
18.10
28.00
Calculated Relative Intensity Colors of Pyrolusite in Air
Relative Intensity
0%
50%
100%
150%
200%
250%
300%
350%
400%
450%
480%
R1
R2
Calculated Properties of Pyrolusite
Electron Density:
Bulk Density (Electron Density)=4.94 gm/cc note: Specific Gravity of Pyrolusite =5.24 gm/cc.
Fermion Index:
Fermion Index = 0.0001766733 Boson Index = 0.9998233267
Photoelectric:
PEPyrolusite = 16.61 barns/electron U=PEPyrolusite x rElectron Density= 82.07 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pyrolusite is Not Radioactive
Chemical Formula: 
