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May contain K replacing Na.
Dark brownish-gray
Resinous, Dull
3 - 3½
Specific Gravity:
Crystal System:
Named in 1967 by Matsuo Nambu and Katsutoshi Tanida in honor of Dr. Manjiro Watanabe [1891 Japan - 1980 Japan], mineralogist, economic geologist and Professor at Tohoku University, Japan.
Many manganese oxides are better identified using infra-red spectroscopy than by x-ray diffraction because of issues of crystal size, disorder, etc. (Potter and Rossman, 1979).

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Classification of ManjiroiteHide


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

9 : AB8X16

7 : Oxides and Hydroxides
2 : Oxides of the alkali metals

Physical Properties of ManjiroiteHide

Resinous, Dull
Dark brownish-gray
Brownish black
3 - 3½ on Mohs scale
VHN100=181 kg/mm2 - Vickers
None Observed
Probably has a good cleavage similar to other minerals in its group.
Conchoidal, Sub-Conchoidal
4.29 g/cm3 (Measured)    4.23 g/cm3 (Calculated)

Optical Data of ManjiroiteHide


Chemical Properties of ManjiroiteHide


May contain K replacing Na.

Crystallography of ManjiroiteHide

Crystal System:
Class (H-M):
4/m - Dipyramidal
Space Group:
Cell Parameters:
a = 9.916 Å, c = 2.864 Å
a:c = 1 : 0.289
Unit Cell V:
281.61 ų (Calculated from Unit Cell)
Frequently botryoidal, sometimes fibrous

X-Ray Powder DiffractionHide

Powder Diffraction Data:
7.017 (98)
4.941 (77)
3.493 (30)
3.136 (92)
2.406 (100)
2.332 (35)
2.217 (20)
2.160 (69)
1.839 (46)
1.548 (46)
1.642 (30)
1.548 (45)
1.431 (35)
ICDD 21-1153

Type Occurrence of ManjiroiteHide

General Appearance of Type Material:
Fine-grained black masses, may break with a conchoidal fracture.
Geological Setting of Type Material:
Bedded manganese oxide deposit.
Associated Minerals at Type Locality:

Synonyms of ManjiroiteHide

Other Language Names for ManjiroiteHide


Relationship of Manjiroite to other SpeciesHide

Other Members of this group:
CoronaditePb(Mn4+6Mn3+2)O16Mon. 2/m
CryptomelaneK(Mn4+7Mn3+)O16Mon. 2/m
FerricoronaditePb(Mn4+6Fe3+2)O16Tet. 4/m : I4/m
FerrihollanditeBa(Mn4+6Fe3+2)O16Mon. 2/m
HollanditeBa(Mn4+6Mn3+2)O16Mon. 2/m
StrontiomelaneSr(Mn4+6Mn3+2)O16Mon. 2/m : P21/b

Common AssociatesHide

Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
Associated Minerals Based on Photo Data:
Calcite2 photos of Manjiroite associated with Calcite on
Todorokite2 photos of Manjiroite associated with Todorokite on

Related Minerals - Nickel-Strunz GroupingHide

4.DK.05Akaganeite(Fe3+,Ni2+)8(OH,O)16Cl1.25 · nH2OMon. 2/m
4.DK.05aCoronaditePb(Mn4+6Mn3+2)O16Mon. 2/m
4.DK.05aCryptomelaneK(Mn4+7Mn3+)O16Mon. 2/m
4.DK.05aHollanditeBa(Mn4+6Mn3+2)O16Mon. 2/m
4.DK.05bMannarditeBa(Ti4+6V3+2)O16Tet. 4/m : I41/a
4.DK.05bHenrymeyeriteBa(Ti4+7Fe2+)O16Tet. 4/m : I4/m
4.DK.05aStrontiomelaneSr(Mn4+6Mn3+2)O16Mon. 2/m : P21/b
4.DK.10Romanèchite(Ba,H2O)2(Mn4+,Mn3+)5O10Mon. 2/m
4.DK.10Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2OMon. 2/m : P2/m

Related Minerals - Dana Grouping (8th Ed.)Hide 2/m 2/m 2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.2.1Lithiophorite(Al,Li)MnO2(OH)2Trig. 3m (3 2/m) : R3m
7.2.4CryptomelaneK(Mn4+7Mn3+)O16Mon. 2/m

Fluorescence of ManjiroiteHide

Not fluorescent in UV

Other InformationHide

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

References for ManjiroiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nambu M, Tanida K (1967) Manjirōite, a new manganese dioxide mineral, from Kohare Mine, Iwate Prefecture, Japan, Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 58, 39-54.
Fleischer, Michael (1968) Manjiroite. New mineral names, American Mineralogist, 53, 2103-2106.
Potter, Russell M. and Rossman, George R. (1979) The tetravalent manganese oxides: identification, hydration, and structural relationships by infrared spectroscopy, American Mineralogist, 64, 1199-1218.
Mineralogical Society of Japan (1980): 14: 72.
Biagioni, C., Capalbo, C., Pasero, M. (2013): Nomenclature tunings in the hollandite supergroup. European Journal of Mineralogy, 25, 85-90.

Internet Links for ManjiroiteHide

Localities for ManjiroiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Nova Scotia
    • Lunenburg Co.
      • New Ross
O'Reilly, G.A. (1992) Petrographic and geochemical Evidence for a Hypogene Origin of Granite-Hosted, Vein-Type Mn Mineralization at the New Ross Mn Deposits, Lunenburg County, Nova Scotia, Canada. Economic Geology: 87: 1275-1300.
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
sample analysed by Anatoly Kasatkin, Russia
Democratic Republic of the Congo
  • Katanga (Shaba)
    • Lulua
Paul De Bondt collection
  • Rhineland-Palatinate
    • Lahn valley
      • Bad Ems District
        • Frücht
Der Aufschluss Vol.55, March/April 2004
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (I). Mineralien-Welt 25 (1), 60-75 (in German).
  • Honshu Island
    • Chubu Region
      • Shizuoka Prefecture
        • Kawazu
Powder XRD by John Attard, January 2008.
    • Tohoku Region
      • Iwate Prefecture
        • Karumai
Nambu M, Tanida K (1967) Manjirōite, a new manganese dioxide mineral, from Kohare Mine, Iwate Prefecture, Japan. Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists 58, 39-54
Dr. Matsuo Nambu collection (curated at Geological Survey of Japan); Nambu M, Tanida K (1967) Manjirōite, a new manganese dioxide mineral, from Kohare Mine, Iwate Prefecture, Japan. Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists 58, 39-54
        • Kuji City
          • Yamagata
Nambu & Tanida (1980) Koubutsugaku Zasshi, 14 (special volume), 62-85.
        • Kunohe-gun
          • Hirono-cho
            • Ono
Dr. Matsuo Nambu collection (curated at Geological Survey of Japan); Nambu M, Tanida K (1967) Manjirōite, a new manganese dioxide mineral, from Kohare Mine, Iwate Prefecture, Japan. Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists 58, 39-54
          • Karumai-cho
Nambu & Tanida (1980) Koubutsugaku Zasshi, 14 (special volume), 62-85.
        • Kunohe
Dr. Matsuo Nambu collection (curated at Geological Survey of Japan)
  • Guarda District
    • Gouveia
      • Folgosinho
-Idoia Garate-Olabe,Encarnacion Roda-Robles,Pedro-Pablo Gil-Crespo, Alfonso Pérez,Romeu Vieira, Alexandra Lima, Estudio Textural y Mineralogico del Dique de Cuarzo con Fosfatos de Folgosinho (Guarda, Portugal) Macle N°16 junio 2012 revista de la sociedad espanola de mineralogia
  • Caraş-Severin Co.
    • Banat Mts
      • Ocna de Fier-Dognecea District
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
        • Plast
          • Kochkar' District
            • Svetlyi
Igor Savin's data
South Africa
  • Northern Cape Province
    • Kalahari manganese field
Minerals of South Africa; Preston, P. C. C. R. (2009). Physical and chemical characterization of the manganese ore bed at the Mamatwan mine, Kalahari manganese field (Doctoral dissertation).
Willy Israel and Clement Smith collections
  • Arizona
    • Cochise Co.
      • Tombstone Hills
        • Tombstone District
          • Oregon-Prompter Mine group
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 289.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.:76
  • Colorado
    • Teller Co.
      • Cripple Creek District
Econ Geol (1985) 80:1669-1688
Min Rec 36:2 pp143-185
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
Mike Scott S106121 from Cureton 1990 ID A. Roberts GSC 1991
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