Mineralogy Database

Manganhumite Mineral Data

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General Manganhumite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Mg)7(SiO4)3(OH)2
Help on Composition: Composition: Molecular Weight = 641.22 gm
   Magnesium   6.63 %  Mg   11.00 % MgO
   Manganese  44.98 %  Mn   58.08 % MnO
   Silicon    13.14 %  Si   28.11 % SiO2
   Hydrogen    0.31 %  H     2.81 % H2O
   Oxygen     34.93 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+5.25Mg1.75(SiO4)3(OH)2
Help on Environment: Environment: A late-stage skarn mineral formed in recrystallized limestone banded between layers of manganese ore minerals
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Brattfors mine, Nordmark, and at Langban, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for manganese in the composition and relation to humite.
Help on Name Pronunciation: Name Pronunciation: Manganhumite + Pronunciation Say MANGANHUMITE
Help on Synonym: Synonym: ICSD 200351
  PDF 29-866
 

Manganhumite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4551:1:2.0272
Help on Cell Dimensions: Cell Dimensions: a = 4.815, b = 10.58, c = 21.448, Z = 4; V = 1,092.62 Den(Calc)= 3.90
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.7823(1), 3.393(0.89), 2.513(0.79),
 

Physical Properties of Manganhumite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Brown, Brown orange, Light orange.
Help on Density: Density: 3.83
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Manganhumite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.088 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.104 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1831,KPDmeas= 0.1864,KC= 0.2044
Ncalc = 1.78 - 1.8
Help on Optical Data: Optical Data: Biaxial (+), a=1.707, b=1.712, g=1.723, bire=0.0160, 2V(Calc)=70, 2V(Meas)=37.
 

Calculated Properties of Manganhumite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Manganhumite =3.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEManganhumite = 12.22 barns/electron
U=PEManganhumite x rElectron Density= 45.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Manganhumite is Not Radioactive
 

Manganhumite Classification

Help on  Dana Class: Dana Class: 52.03.02c.03 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03)with cations in [6] coordination only
  (52.03.02c)Humite group (Humite series)
 
52.03.02c.01 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m
 
52.03.02c.02 Leucophoenicite Mn7(SiO4)3(OH)2 P 21/a 2/m
 
52.03.02c.03 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
 
52.03.02c.04 Chegemite! Ca7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AF.50 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
 
09.AF.50 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
 
09.AF.50 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m
 
09.AF.50 Chegemite! Ca7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
 

Other Manganhumite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Manganhumite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Manganhumite Specimen Label here :

Manganhumite

(Mn,Mg)7(SiO4)3(OH)2
Dana No: 52.03.02c.03 Strunz No: 09.AF.50
Locality:

 

Notes:

 

 
   
 


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