Hollandite Mineral Data

Hollandite Mineral Data +

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General Hollandite Information

Chemical Formula:

Ba(Mn++++,Mn++)8O16

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

Empirical Formula:

Ba_0.8Pb_0.2Na_0.1Mn⁴⁺_6.1Fe³⁺_1.3Mn²⁺_0.5Al_0.2Si_0.1O₁₆

Environment:

Primary mineral in contact metamorphism of manganese ores.

IMA Status:

Valid Species (Pre-IMA) 1906

Locality:

Manganese deposits of the Central Provinces of India. Link to MinDat.org Location Data.

Name Origin:

Named for Thomas Henry Holland (1868-1947), Director of the Indian Geologic Survey.

Synonym:

ICSD 27240

PDF 38-476

Hollandite Image

Images:

Hollandite

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

Hollandite Crystallography

Axial Ratios:

a:b:c =3.4836:1:3.3804

Cell Dimensions:

a = 10.026, b = 2.878, c = 9.729, Z = 1; beta = 91.03° V = 280.68 Den(Calc)= 5.05

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.143(1), 3.101(0.98), 2.412(0.73),

Crystal Structure:

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Zhang J , Ko J , Hazen R M , Prewitt C T , American Mineralogist , 78 (1993) p.493-499, High-pressure crystal chemistry of KAlSi3O8 hollandite, Pressure = 0.00 GPa

View Additional jPOWD Structure files for Hollandite
[1] [2] [3] [4] [5] [6] [7]

Physical Properties of Hollandite

Cleavage:

[???] Good

Color:

Grayish black, Black, Silver gray.

Density:

4.7 - 5, Average = 4.84

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

4-6

Luminescence:

Non-fluorescent.

Luster:

Earthy (Dull)

Streak:

black

Optical Properties of Hollandite

Optical Data:

Biaxial (?)

NCalc= 2.58 - from Gladstone-Dale relationship (KC = 0.3133) where Ncalc=Dcalc*KC+1
NCalc= 2.52 - from Gladstone-Dale relationship (KC = 0.3133) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Strong.

RL Color:

White.

RL Pleochroism:

Weak.

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

Electron Density:

r_electron=4.65 gm/cc
note: r_Hollandite=5.05 gm/cc.

Fermion Index

Fermion Index = 0.03579
Boson Index = 0.96421

Photoelectric:

PE_Hollandite= 151.07 barns/electron
U=PE_Hollandite x r_electron= 703.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hollandite is Not Radioactive

Hollandite Classification

Dana Class:

7.9.1.1 (7)Multiple Oxides

(7.9)where A B (O)2

(7.9.1)Cryptomelane Group (Hard black, fine-grained)

7.9.1.1 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

7.9.1.2 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

7.9.1.3 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m

7.9.1.4 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

7.9.1.5 Strontiomelane! SrMn6Mn2O16 P 2₁/m 2/m

7.9.1.6 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

Strunz Class:

IV/D.08-60 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.08 - Cryptomelane group

IV/D.08-10 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m

IV/D.08-20 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

IV/D.08-25 Strontiomelane! SrMn6Mn2O16 P 2₁/m 2/m

IV/D.08-30 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m

IV/D.08-33 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

IV/D.08-35 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m

IV/D.08-40 Mannardite BaTi6V2O16·(H2O) I 4₁/a 4/m

IV/D.08-50 Redledgeite BaTi6Cr2O16·(H2O) I 4₁/a 4/m

IV/D.08-60 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

IV/D.08-70 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

IV/D.08-80 Cesarolite PbH2Mn3O8 HEX-R Trig

Other Hollandite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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Hollandite

Ba(Mn++++,Mn++)8O16
Dana No: 7.9.1.1 Strunz No: IV/D.08-60
Locality:

Notes: