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Hollandite

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Königsberg, Wolfstein, Palatinate, Rhineland-Palatinate, Germany
© Peter Haas

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Formula:
Ba(Mn
4+
6
Mn
3+
2
)O
 
16
Formerly defined as Ba(Mn4+,Mn2+)8O16.
System:MonoclinicColour:Silvery-grey to greyish ...
Hardness:4 - 6
Member of:Coronadite Group > Hollandite Supergroup
Name:After T.H. Holland (1868-1947), Director, Geological Survey of India.


In 2012, the IMA revised the nomenclature of the Hollandite Supergroup (Biagioni et al., 2013).
Hollandite is now redefined as the (more widespread) Ba-Mn3+ end-member of the coronadite group; concurrently, type hollandite is redefined as ferrihollandite, a new name to denote the Ba-Fe3+ end-member (Biagioni et al., 2013).

The original type locality for hollandite is now that of ferrihollandite; the neotype locality for hollandite is Gowari Wadhona (misspelt Gowani Wadhona in Biagioni et al., 2013).

Chemically similar to romanèchite.

Classification of Hollandite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/D.08-60
Nickel-Strunz 10th (pending) edition ID:4.DK.05a

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
K : With large (+- medium-sized) cations; tunnel structures
Dana 8th edition ID:7.9.1.1

7 : MULTIPLE OXIDES
9 : AB8X16
Hey's CIM Ref.:7.4.17

7 : Oxides and Hydroxides
4 : Oxides of Be, Mg and the alkaline earths
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Type Occurrence of Hollandite

Type Locality:Gowari Wadhona Mine, Chhindwara District (Chindawara District; Chindwara District), Jabalpur Division, Madhya Pradesh, India
Year of Discovery:1906

Physical Properties of Hollandite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Silvery-grey to greyish black, black
Streak:Black
Hardness (Mohs):4 - 6
Tenacity:Brittle
Cleavage:Distinct/Good
Prismatic.
Parting:Crystals readily break parallel to [001] into striated chips or fibers.
Density (measured):4.95 g/cm3

Crystallography of Hollandite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 10.02Å, b = 2.87Å, c = 9.72Å
β = 91.03°
Ratio:a:b:c = 3.491 : 1 : 3.387
Unit Cell Volume:V 279.48 ų (Calculated from Unit Cell)
Morphology:Crystals short prismatic, terminated by a flat pyramid. Massive, fibrous.
Twinning:Reported (non-specific).
X-Ray Powder Diffraction:
d-spacingIntensity
4.864 (5)
3.522 (35)
3.460 (35)
3.178 (58)
3.143 (100)
3.101 (98)
3.069 (58)
2.760 (11)
2.506 (4)
2.412 (73)
2.244 (11)
2.212 (17)
2.204 (25)
2.181 (32)
2.173 (24)
2.153 (29)
1.9986 (7)
1.9865 (2)
1.9812 (2)
1.9706 (14)
1.9035 (5)
1.8601 (18)
1.8506 (8)
1.8310 (6)
1.8220 (24)
1.7611 (6)
1.7298 (6)
1.7191 (2)
1.6946 (6)
1.6917 (6)
1.6707 (21)
1.6212 (20)
1.6142 (13)
1.5654 (5)
1.5514 (23)
1.5411 (20)
Comments:JCPDS 34-174

Optical Data of Hollandite

Type:Anisotropic
Anisotropism:Strong
Colour in reflected light:White
Pleochroism:Weak

Chemical Properties of Hollandite

Formula:
Ba(Mn
4+
6
Mn
3+
2
)O
 
16


Formerly defined as Ba(Mn4+,Mn2+)8O16.
Essential elements:Ba, Mn, O
All elements listed in formula:Ba, Mn, O
Common Impurities:Fe,Pb,K,Na

Relationship of Hollandite to other Species

Member of:Coronadite Group > Hollandite Supergroup
Other Members of Group:

- +
Coronadite
Pb(Mn
4+
6
Mn
3+
2
)O
 
16
Cryptomelane
K(Mn
4+
7
Mn
3+
 
)O
 
16
Ferrihollandite
Ba(Mn
4+
6
Fe
3+
2
)O
 
16
Manjiroite
Na(Mn
4+
7
Mn
3+
 
)O
 
16
Strontiomelane
Sr(Mn
4+
6
Mn
3+
2
)O
 
16
Related Minerals - Nickel-Strunz Grouping):

- +
4.DK.05Akaganeite
β-Fe
3+
 
O(OH,Cl)
4.DK.05aCoronadite
Pb(Mn
4+
6
Mn
3+
2
)O
 
16
4.DK.05aCryptomelane
K(Mn
4+
7
Mn
3+
 
)O
 
16
4.DK.05aManjiroite
Na(Mn
4+
7
Mn
3+
 
)O
 
16
4.DK.05bMannardite
Ba(Ti
4+
6
V
3+
2
)O
 
16
4.DK.05bPriderite
K(Ti
4+
7
Fe
3+
 
)O
 
16
4.DK.05bRedledgeite
Ba(Ti
4+
6
Cr
3+
2
)O
 
16
4.DK.05bHenrymeyerite
Ba(Ti
4+
7
Fe
2+
 
)O
 
16
4.DK.05aStrontiomelane
Sr(Mn
4+
6
Mn
3+
2
)O
 
16
4.DK.10Romanèchite
(Ba,H
 
2
O)
 
2
Mn
 
5
O
 
10
4.DK.10Todorokite
(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)
 
6
O
 
12
 · 3H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
7.4.1Bromellite
BeO
7.4.2Behoite
Be(OH)
 
2
7.4.3Clinobehoite
Be(OH)
 
2
7.4.4Chrysoberyl
BeAl
 
2
O
 
4
7.4.5Magnesiotaaffeite-2N’2S
Mg
 
3
Al
 
8
BeO
 
16
7.4.6Magnesiotaaffeite-6N’3S
Mg
 
2
BeAl
 
6
O
 
12
7.4.7Periclase
MgO
7.4.8Brucite
Mg(OH)
 
2
7.4.9Spinel
MgAl
 
2
O
 
4
7.4.10Meixnerite
Mg
 
6
Al
 
2
(OH)
 
16
(OH)
 
2
 · 4H
 
2
O
7.4.11Lime
CaO
7.4.12Portlandite
Ca(OH)
 
2
7.4.13Mayenite
Ca
 
12
Al
 
14
O
 
33
7.4.14Hydrocalumite
Ca
 
8
Al
 
4
(OH)
 
12
(Cl,CO
 
3
,OH)
 
2-x
 · 4H
 
2
O
7.4.15Marokite
CaMn
 
2
O
 
4
7.4.16Ranciéite
(Ca,Mn)Mn
 
4
O
 
9
 · 3H
 
2
O
7.4.18Romanèchite
(Ba,H
 
2
O)
 
2
Mn
 
5
O
 
10
7.4.19Todorokite
(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)
 
6
O
 
12
 · 3H
 
2
O

Other Names for Hollandite

Other Languages:
German:Hollandit
Russian:Голландит
Simplified Chinese:锰钡矿
Spanish:Hollandita
Traditional Chinese:錳鋇礦

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Hollandite

Reference List:

- +
Fermor (1906), Transactions of the Min. Geol. Institute of India: 1: 76.

Fermor (1908), Geological Survey of India, Records: 36: 295.

Fermor (1909), Geological Survey of India, Mem.: 37: 87.

Fermor (1917), Geological Survey of India, Records: 48: 103.

Orcel and Pavlovitch (1931), Bull. soc. min.: 54: 134.

Schneiderhöhn and Ramdohr (1931): 2: 514.

Frondel, C. and Heinrich (1942), American Mineralogist: 27: 48.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 743-744.

American Mineralogist (1953): 38: 1056-1065.

Post J. E., Von Dreele R. B., Buseck P. R. (1982), Symmetry and Cation Displacement in Hollandites: Structure Refinements of Hollandite, Cryptomelane and Priderite. Acta Crystallographica: B38: 1056-1065.

Miura, H. (1986) The crystal structure of hollandite. Mineralogical Journal of Japan: 13(3): 119-129.

Biagioni, C., Capalbo, C., Pasero, M. (2013): Nomenclature tunings in the hollandite supergroup. European Journal of Mineralogy 25, 85-90.

Internet Links for Hollandite

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    • Localities for Hollandite

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    Locality Updated: Myall Lakes Reserve, Bolton, Victoria, AustraliaFrom Pat Sutton, 23rd May 2013 01:30:19