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Pyrochroite Mineral Data

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General Pyrochroite Information

Help on Chemical  Formula: Chemical Formula: Mn(OH)2
Help on Composition: Composition: Molecular Weight = 88.95 gm
   Manganese  61.76 %  Mn   79.75 % MnO
   Hydrogen    2.27 %  H    20.25 % H2O
   Oxygen     35.97 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+(OH)2
Help on Environment: Environment: Secondary mineral after hausmannite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1864
Help on Locality: Locality: Vermland at Pajsberg near Persberg, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek, puro, "fire" and khroma, "color", because of the change in color upon ignition.
Help on Name Pronunciation: Name Pronunciation: Pyrochroite + Pronunciation Say PYROCHROITE
Help on Synonym: Synonym: ICSD 23591
  PDF 18-787

Pyrochroite Image

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Comments: Pseudo-cubic crystal of pyrochroite on matrix.
Location: Franklin, Sussex County, New Jersey, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Shigaite   Pyrochroite

Comments: Bronzy yellow crystals of shigaite set in a crystalline matrix of reddish black pychroite.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 2.8 x 2.3 cm.
© John Veevaert

Pyrochroite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.40119
Help on Cell Dimensions: Cell Dimensions: a = 3.34, c = 4.68, Z = 1; V = 45.21 Den(Calc)= 3.27
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.45(1), 4.72(0.9), 1.826(0.6),
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: ( 3 0 2) ( 9 0 4) ( 1 1 0) ( 1 0 1) ( 0 0 1)

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


Physical Properties of Pyrochroite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Colorless, White, Pale green, Blue, Dark brown.
Help on Density: Density: 3.26
Help on Diaphaneity: Diaphaneity: Subtranslucent to opaque
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Pyrochroite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2144,KPDmeas= 0.215,KC= 0.226
Ncalc = 1.74
Help on Optical Data: Optical Data: Uniaxial (-), e=1.72-1.723, w=1.68-1.681, bire=0.0400-0.0420.

Calculated Properties of Pyrochroite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.15 gm/cc
note: Specific Gravity of Pyrochroite =3.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001760689
Boson Index = 0.9998239311
Help on Photoelectric: Photoelectric: PEPyrochroite = 15.83 barns/electron
U=PEPyrochroite x rElectron Density= 49.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pyrochroite is Not Radioactive

Pyrochroite Classification

Help on  Dana Class: Dana Class: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.02)where X++ (OH)2
  (06.02.01)Brucite group (Rhombohedral: P-3m1) Brucite Mg(OH)2 P 3m1 3 2/m Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m Pyrochroite Mn(OH)2 P 3m1 3 2/m Portlandite Ca(OH)2 P 3m1 3 2/m Theophrastite Ni(OH)2 P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 04.FE.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
04.FE.05 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m
04.FE.05 Brucite Mg(OH)2 P 3m1 3 2/m
04.FE.05 Portlandite Ca(OH)2 P 3m1 3 2/m
04.FE.05 Pyrochroite Mn(OH)2 P 3m1 3 2/m
04.FE.05 Theophrastite Ni(OH)2 P 3m1 3 2/m
04.FE.05 Fougerite! (Fe,Mg)6Fe2(OH)18•4(H2O) R 3m 3 2/m

Other Pyrochroite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Pyrochroite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - HyperPhysics
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 04.FE.05





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