Hollandite Mineral Data

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.

Name Pronunciation:

Hollandite + Pronunciation

Synonym:

ICSD 27240

PDF 38-476

Hollandite Image

Images:

Hollandite

Comments: Gray, feathery aggregates of hollandite.
Location: Sieben BrÃ¼der 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 - Prismatic H-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),

Physical Properties of Hollandite

Cleavage:

{???} Good

Color:

Grayish black, Black, Silver gray.

Density:

4.7 - 5, Average = 4.84

Diaphaneity:

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= 2.62 - 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

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:

Bulk Density (Electron Density)=4.65 gm/cc
note: Specific Gravity of Hollandite =5.05 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Hollandite= 151.07 barns/electron
U=PE_Hollandite x rElectron Density= 703.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hollandite is Not Radioactive

Hollandite Classification

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

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 (ï¿½ 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

References:

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

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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