Mineralogy Database

Pyrolusite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Pyrolusite + Pronunciation Say PYROLUSITE
Help on Synonym: Synonym: ICSD 73716
  PDF 24-735

Pyrolusite Image

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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 Dipyramidal H-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:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 1) ( 1 2 0) ( 1 1 1) ( 1 1 0)

Warning: this java applet does not work in some browsers because of security restrictions.


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 Diaphaneity: Diaphaneity: 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: Non-fluorescent.
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
   0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 480%

Calculated Properties of Pyrolusite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.94 gm/cc
note: Specific Gravity of Pyrolusite =5.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001766733
Boson Index = 0.9998233267
Help on Photoelectric: Photoelectric: PEPyrolusite = 16.61 barns/electron
U=PEPyrolusite x rElectron Density= 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: (04)Simple Oxides
  (04.04)with a cation charge of 4+ (A++++ O2)
  (04.04.01)Rutile group (Tetragonal: P4/mnm) Rutile TiO2 P 4/mnm 4/m 2/m 2/m Ilmenorutile (Ti,Nb,Fe)O2 P 4/mnm 4/m 2/m 2/m Struverite? (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m Pyrolusite MnO2 P 4/mnm 4/m 2/m 2/m Cassiterite SnO2 P 4/mnm 4/m 2/m 2/m Plattnerite PbO2 P 4/mnm 4/m 2/m 2/m Argutite GeO2 P 4/mnm 4/m 2/m 2/m Squawcreekite? (Fe,Sb,W)O4•(H2O) P 4/mnm 4/m 2/m 2/m Stishovite SiO2 P 4/mnm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DB -With medium-sized cations; chains of edge-sharing octahedra
04.DB.05 Argutite GeO2 P 4/mnm 4/m 2/m 2/m
04.DB.05 Cassiterite SnO2 P 4/mnm 4/m 2/m 2/m
04.DB.05 Rutile TiO2 P 4/mnm 4/m 2/m 2/m
04.DB.05 Pyrolusite MnO2 P 4/mnm 4/m 2/m 2/m
04.DB.05 Plattnerite PbO2 P 4/mnm 4/m 2/m 2/m
04.DB.05 Varlamoffite* (Sn,Fe)(O,OH)2 P 41/mnm 4/m 2/m 2/m
04.DB.05 Squawcreekite? (Fe,Sb,W)O4•(H2O) P 4/mnm 4/m 2/m 2/m
04.DB.05 Tugarinovite MoO2 P 21/n 2/m
04.DB.05 Tripuhyite FeSbO4 P 41/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 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Glendale Community College
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - Scandinavian mineral gallery
19 - University of Colorado - Mineral Structure Data
21 - YupRocks

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Dana No: Strunz No: 04.DB.05





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