Pyrolusite Mineral Data + Say PYROLUSITE

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General Pyrolusite Information
Help on Chemical Formula: Chemical Formula: MnO2
Help on Composition: Composition: Molecular Weight = 86.94 gm
   Manganese  63.19 %  Mn  100.00 % MnO2
   Oxygen     36.81 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn4+O2
Help on Environment: Environment: Sedimentary, hydrothermal, and secondary.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1827
Help on Locality: Locality: Common world wide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, pyro and louein, "fire" and "to wash," because it was used to remove the greenish color imparted to glass by iron compounds.
Help on Synonym: Synonym: ICSD 73716
  PDF 24-735
  Polianite
  Wad
 

Pyrolusite Image

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Pyrolusite

Comments: Steel-gray metallic prismatic pyrolusite crystals.
Location: Hori Blatna, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pyrolusite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.65148
Help on Cell Dimensions: Cell Dimensions: a = 4.39, c = 2.86, Z = 2; V = 55.12 Den(Calc)= 5.24
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.14(1), 1.63(0.5), 2.41(0.5),
Help on Forms: Forms:

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Forms: [ 0 1 1] [ 1 2 0] [ 1 1 1] [ 1 1 0]

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Click Here for Large Pyrolusite Structure Window Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.239-444, Second edition. Interscience Publishers, New York, New York, Note: beta phase of MnO2, rutile structure

 

Physical Properties of Pyrolusite

Help on Cleavage: Cleavage: [110] Perfect
Help on Color: Color: Steel gray, Iron gray, Bluish gray.
Help on Density: Density: 4.4 - 5.06, Average = 4.73
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite).
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Sub Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: black
 

Optical Properties of Pyrolusite

Help on Optical Data: 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
Help on RL Anisotrophism: RL Anisotrophism: Strong in yellow.
Help on RL Bireflectance: RL Bireflectance: Weak, yellow to yellow-gray.
Help on RL Color: RL Color: White with creamy yellow tint.
Help on Reflectivity 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

Help on Electron Density: Electron Density:

relectron=4.94 gm/cc
note: rPyrolusite =5.24 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00017
Boson Index = 0.99983
Help on Photoelectric: Photoelectric:

PEPyrolusite = 16.61 barns/electron
U=PEPyrolusite x relectron= 82.07 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pyrolusite is Not Radioactive
 

Pyrolusite Classification
Help on Dana Class: Dana Class: 4.4.1.4 (4)Simple Oxides
  (4.4)with a cation charge of 4+ (A++++ O2)
  (4.4.1)Rutile group (Tetragonal: P4/mnm)
 
4.4.1.1 Rutile TiO2 P 4/mnm 4/m 2/m 2/m
 
4.4.1.2 Ilmenorutile (Ti,Nb,Fe)O2 P 4/mnm 4/m 2/m 2/m
 
4.4.1.3 Struverite (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m
 
4.4.1.4 Pyrolusite MnO2 P 4/mnm 4/m 2/m 2/m
 
4.4.1.5 Cassiterite SnO2 P 4/mnm 4/m 2/m 2/m
 
4.4.1.6 Plattnerite PbO2 P 4/mnm 4/m 2/m 2/m
 
4.4.1.7 Argutite GeO2 P 4/mnm 4/m 2/m 2/m
 
4.4.1.8 Squawcreekite? (Fe,Sb,W)O4·(H2O) P 4/mnm 4/m 2/m 2/m
 
4.4.1.9 Stishovite SiO2 P 4/mnm 4/m 2/m 2/m
Help on Strunz Class: Strunz Class: IV/D.02-20 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.02 - Rutile group, Rutile - Cassiterite - Platnerite series
 
IV/D.02-10 Rutile TiO2 P 4/mnm 4/m 2/m 2/m
 
IV/D.02-20 Pyrolusite MnO2 P 4/mnm 4/m 2/m 2/m
 
IV/D.02-30 Squawcreekite? (Fe,Sb,W)O4·(H2O) P 4/mnm 4/m 2/m 2/m
 
IV/D.02-40 Cassiterite SnO2 P 4/mnm 4/m 2/m 2/m
 
IV/D.02-45 Argutite GeO2 P 4/mnm 4/m 2/m 2/m
 
IV/D.02-50 Paratellurite TeO2 P 41212,P 43212 4 2 2
 
IV/D.02-60 Plattnerite PbO2 P 4/mnm 4/m 2/m 2/m
 

Other Pyrolusite Information
Help on References: References: NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Pyrolusite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Glendale Community College 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (UofA) 11 - HyperPhysics 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 -Mineralienatlas (Deutsch) 16 - Minerals of Wisconsin 17 -QUT Mineral Atlas 18 - Scandinavian mineral gallery 19 -University of Colorado - Mineral Structure Data 20 -University of Minnesota 21 - WWW-MINCRYST 22 - YupRocks 23 -École des Mines de Paris

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Pyrolusite

MnO2
Dana No: 4.4.1.4 Strunz No: IV/D.02-20
Locality:

 

Notes:

 
 
   
 
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