Mineralogy Database

Hollandite Mineral Data

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General Hollandite Information

Help on Chemical  Formula: Chemical Formula: Ba(Mn++++,Mn++)8O16
Help on Composition: Composition: Molecular Weight = 852.99 gm
   Barium     12.88 %  Ba   14.38 % BaO
   Sodium      0.27 %  Na    0.36 % Na2O
   Manganese  42.51 %  Mn    4.16 % MnO / 62.17 % MnO2
   Aluminum    0.63 %  Al    1.20 % Al2O3
   Iron        8.51 %  Fe   12.17 % Fe2O3
   Silicon     0.33 %  Si    0.70 % SiO2
   Lead        4.86 %  Pb    5.23 % PbO
   Oxygen     30.01 %  O
             ______        ______ 
             100.00 %      100.38 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba0.8Pb0.2Na0.1Mn4+6.1Fe3+1.3Mn2+0.5Al0.2Si0.1O16
Help on Environment: Environment: Primary mineral in contact metamorphism of manganese ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1906
Help on Locality: Locality: Manganese deposits of the Central Provinces of India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Thomas Henry Holland (1868-1947), Director of the Indian Geologic Survey.
Help on Name Pronunciation: Name Pronunciation: Hollandite + Pronunciation Say HOLLANDITE
Help on Synonym: Synonym: ICSD 27240
  PDF 38-476
 

Hollandite Image

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  Hollandite

Comments: Gray, feathery aggregates of hollandite.
Location: Sieben Brüder Mine, Langenberg, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Hollandite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.4836:1:3.3804
Help on Cell Dimensions: Cell Dimensions: a = 10.026, b = 2.878, c = 9.729, Z = 1; beta = 91.03° V = 280.68 Den(Calc)= 5.05
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.143(1), 3.101(0.98), 2.412(0.73),
 

Physical Properties of Hollandite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Grayish black, Black, Silver gray.
Help on Density: Density: 4.7 - 5, Average = 4.84
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 4-6
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: black
 

Optical Properties of Hollandite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 2.62 - from Gladstone-Dale relationship (KC = 0.3215) where Ncalc=Dcalc*KC+1
NCalc= 2.56 - from Gladstone-Dale relationship (KC = 0.3215) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Color: RL Color: White.
Help on RL Pleochroism: RL Pleochroism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Hollandite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   31.30   37.70 
   
 420 nm   31.20   37.40 
 440 nm   31.10   37.10 
 460 nm   30.50   36.50 
 480 nm   29.70   35.90 
 500 nm   29.10   35.00 
 520 nm   28.50   34.20 
 540 nm   27.80   33.10 
 560 nm   27.10   32.20 
 580 nm   26.60   31.50 
 600 nm   26.30   30.90 
 620 nm   26.10   30.40 
 640 nm   25.80   30.00 
 660 nm   25.60   29.50 
 680 nm   25.30   29.00 
 700 nm   25.00   28.30 
Calculated Relative Intensity Colors of Hollandite in Air
Relative
Intensity
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 330%
R1                      
R2                      
 

Calculated Properties of Hollandite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.65 gm/cc
note: Specific Gravity of Hollandite =5.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEHollandite = 151.07 barns/electron
U=PEHollandite x rElectron Density= 703.17 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hollandite is Not Radioactive
 

Hollandite Classification

Help on  Dana Class: Dana Class: 07.09.01.01 (07)Multiple Oxides
  (07.09)Dana Type
  (07.09.01)Cryptomelane Group (Hard black, fine-grained)
 
07.09.01.01 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m
 
07.09.01.02 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m
 
07.09.01.03 Manjiroite (Na,K)(Mn,Mn)8O16•n(H2O) I 4/m 4/m
 
07.09.01.04 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m
 
07.09.01.05 Strontiomelane! SrMn6Mn2O16 P 21/m 2/m
 
07.09.01.06 Henrymeyerite! BaFeTi7O16 I 4/m 4/m
Help on  Strunz Class: Strunz Class: 04.DK.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DK -With large (� medium-sized) cations; tunnel structures
 
04.DK.05 Akaganeite Fe(O,OH,Cl) I2/m 2/m
 
04.DK.05 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m
 
04.DK.05 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m
 
04.DK.05 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m
 
04.DK.05 Manjiroite (Na,K)(Mn,Mn)8O16•n(H2O) I 4/m 4/m
 
04.DK.05 Mannardite BaTi6V2O16•(H2O) I 41/a 4/m
 
04.DK.05 Redledgeite BaTi6Cr2O16•(H2O) I 41/a 4/m
 
04.DK.05 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m
 
04.DK.05 Henrymeyerite! BaFeTi7O16 I 4/m 4/m
 

Other Hollandite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Hollandite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - Scandinavian mineral gallery
15 - WWW-MINCRYST

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

Hollandite

Ba(Mn++++,Mn++)8O16
Dana No: 07.09.01.01 Strunz No: 04.DK.05
Locality:

 

Notes:

 

 
   
 


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