Mindat Logo

Hollandite

This page is currently not sponsored. Click here to sponsor this page.



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
mindat.org URL:http://www.mindat.org/min-1921.html
Please feel free to link to this page.

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.
Simplified for copy/paste:Ba(Mn4+6Mn3+2)O16
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
7.4.13Chlormayenite
Ca
 
12
Al
 
14
O
 
32
Cl
 
2
7.4.14Hydrocalumite
Ca
 
4
Al
 
2
(OH)
 
12
(Cl,CO
 
3
,OH)
 
2
· 4H
 
2
O
7.4.15Marokite
CaMn
3+
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

Search Engines:
  • Look for Hollandite on Google
  • Look for Hollandite images on Google
  • External Links:
  • Look for Hollandite on Webmineral
  • Look for Hollandite on Athena Mineralogy
  • Look for Hollandite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • Hollandite specimens for sale - minfind.com
  • The Arkenstone - Fine Minerals
  • Buy from Dave Bunk Minerals
  • Fine and rare minerals from mintreasure.com
  • Search for Hollandite on Well-Arranged Molecules
  • Buy from McDougall Minerals
  • Buy minerals from YourMineralCollection
  • Buy RARE Minerals from Rocks of Africa
  • Find Hollandite on www.crystalclassics.co.uk
  • Fabre Minerals - search for Hollandite specimens
  • Wilensky Fine Minerals
  • Buy rare minerals from Excalibur Minerals
  • Specimens:The following Hollandite specimens are currently listed for sale on minfind.com.

    Localities for Hollandite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Mineral and/or Locality  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: November 24, 2014 09:45:39
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds