Manjiroite
A valid IMA mineral species
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About Manjiroite
Manjiro Watanabe
Formula:
Na(Mn4+7Mn3+)O16
May contain K replacing Na.
Colour:
Dark brownish-gray
Lustre:
Resinous, Dull
Hardness:
3 - 3½
Specific Gravity:
4.29
Crystal System:
Tetragonal
Member of:
Name:
Named in 1967 by Matsuo Nambu and Katsutoshi Tanida in honor of Dr. Manjiro Watanabe (渡辺万次郎) (2 July 1891 Japan - 20 March 1980 Japan), mineralogist, economic geologist and Professor at Tohoku University, Japan.
Type Locality:
Isostructural with:
A restudy of type manjiroite shows that Na is not the dominant tunnel species, but water (Post et al., 2022).
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).
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).
Unique Identifiers
Mindat ID:
2566
Long-form identifier:
mindat:1:1:2566:5
Similar Names
| Mangerite | A synonym of 'Charnockitic monzonite' |
IMA Classification of Manjiroite
Approved
Approval year:
1966
First published:
1967
Classification of Manjiroite
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
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
7.9.1.3
7 : MULTIPLE OXIDES
9 : AB8X16
7 : MULTIPLE OXIDES
9 : AB8X16
7.2.3
7 : Oxides and Hydroxides
2 : Oxides of the alkali metals
7 : Oxides and Hydroxides
2 : Oxides of the alkali metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Mji | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Mji | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of Manjiroite
Resinous, Dull
Transparency:
Opaque
Colour:
Dark brownish-gray
Streak:
Brownish black
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN100=181 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Probably has a good cleavage similar to other minerals in its group.
Probably has a good cleavage similar to other minerals in its group.
Fracture:
Conchoidal, Sub-Conchoidal
Density:
4.29 g/cm3 (Measured) 4.23 g/cm3 (Calculated)
Optical Data of Manjiroite
Type:
Uniaxial
Chemistry of Manjiroite
Mindat Formula:
Na(Mn4+7Mn3+)O16
May contain K replacing Na.
May contain K replacing Na.
Element Weights:
Elements listed:
Crystallography of Manjiroite
Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
I4/m
Setting:
I4/m
Cell Parameters:
a = 9.916 Å, c = 2.864 Å
Ratio:
a:c = 1 : 0.289
Unit Cell V:
281.61 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Frequently botryoidal, sometimes fibrous
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.017 Å | (98) |
| 4.941 Å | (77) |
| 3.493 Å | (30) |
| 3.136 Å | (92) |
| 2.406 Å | (100) |
| 2.332 Å | (35) |
| 2.217 Å | (20) |
| 2.160 Å | (69) |
| 1.839 Å | (46) |
| 1.548 Å | (46) |
| 1.642 Å | (30) |
| 1.548 Å | (45) |
| 1.431 Å | (35) |
Comments:
ICDD 21-1153
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47e : [Vanadates, chromates, manganates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Geological Setting:
Bedded manganese deposites, also mangabe-rich gossans
Type Occurrence of Manjiroite
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 Manjiroite
Other Language Names for Manjiroite
Relationship of Manjiroite to other Species
Member of:
Other Members of Coronadite Group:
| Coronadite | Pb(Mn4+6Mn3+2)O16 | Mon. 2/m |
| Cryptomelane | K(Mn4+7Mn3+)O16 | Mon. 2/m |
| Ferricoronadite | Pb(Mn4+6Fe3+2)O16 | Tet. 4/m : I4/m |
| Ferrihollandite | Ba(Mn4+6Fe3+2)O16 | Mon. 2/m |
| Hollandite | Ba(Mn4+6Mn3+2)O16 | Mon. 2/m |
| Strontiomelane | Sr(Mn4+6Mn3+2)O16 | Mon. 2/m : P21/b |
| Thalliomelane | Tl(Mn4+7.5Cu2+0.5)O16 | Tet. 4/m : I4/m |
Common Associates
Associations Based on Photo Data:
| 3 photos of Manjiroite associated with Calcite | CaCO3 |
| 3 photos of Manjiroite associated with Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| 1 photo of Manjiroite associated with Cryptomelane | K(Mn4+7Mn3+)O16 |
Related Minerals - Strunz-mindat Grouping
| 4.DK.K | Thalliomelane | Tl(Mn4+7.5Cu2+0.5)O16 |
| 4.DK. | Ferrihollandite | Ba(Mn4+6Fe3+2)O16 |
| 4.DK. | Kopernikite | K(Ti7Cr3+)O16 |
| 4.DK.4.DK. | Ferricoronadite | Pb(Mn4+6Fe3+2)O16 |
| 4.DK.05b | Mannardite | Ba(Ti4+6V3+2)O16 |
| 4.DK.05b | Redledgeite | Ba(Ti4+6Cr3+2)O16 |
| 4.DK.05 | Akaganeite | (Fe3+,Ni2+)8(OH,O)16Cl1.25 · nH2O |
| 4.DK.05a | Coronadite | Pb(Mn4+6Mn3+2)O16 |
| 4.DK.05a | Hollandite | Ba(Mn4+6Mn3+2)O16 |
| 4.DK.05a | Cryptomelane | K(Mn4+7Mn3+)O16 |
| 4.DK.05a | Strontiomelane | Sr(Mn4+6Mn3+2)O16 |
| 4.DK.05b | Henrymeyerite | Ba(Ti4+7Fe2+)O16 |
| 4.DK.05b | Priderite | K(Ti4+7Fe3+)O16 |
| 4.DK.10 | Romanèchite | (Ba,H2O)2(Mn4+,Mn3+)5O10 |
| 4.DK.10 | Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
Fluorescence of Manjiroite
Not fluorescent in UV
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Manjiroite
mindat.org URL:
https://www.mindat.org/min-2566.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Manjiroite
Reference List:
Nambu, Matsuo, Tanida, Katsutoshi (1967) Manjiroite, a new manganese dioxide mineral, from Kohare Mine, Iwate Prefecture, Japan. The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 58 (2) 39-54 doi:10.2465/ganko1941.58.39
Potter, Russell M., Rossman, George R (1979) The tetravalent manganese oxides: identification, hydration, and structural relationships by infrared spectroscopy. American Mineralogist, 64 (11-12) 1199-1218
Nambu, Matsuo, Tanida, Katsutoshi (1980) Cryptomelane-Manjiroite-Hollandite Series Minerals. Journal of the Mineralogical Society of Japan, 14. 62-85 doi:10.2465/gkk1952.14.special3_62
Biagioni, Cristian, Capalbo, Carmen, Pasero, Marco (2013) Nomenclature tunings in the hollandite supergroup. European Journal of Mineralogy, 25 (1) 85-90 doi:10.1127/0935-1221/2013/0025-2255
Localities for Manjiroite
Showing 37 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Márquez-Zavalía et al. (2016) |
Austria | |
| Auer (2020) |
Canada | |
| O'Reilly (1992) |
Chile | |
| Pincheira et al. (1990) |
| sample analysed by Anatoly Kasatkin |
China | |
| |
| |
DR Congo | |
| De Bondt (n.d.) |
Egypt | |
| Salama et al. (2012) |
| Afify et al. (2022) |
Germany | |
| Lorenz (2004) |
| Petitjean et al. (2007) |
| Der Aufschluss Vol.55 |
| ex-coll. G.Hoffmann (Jena) |
Greece | |
| Kolitsch et al. (2014) |
| Kilias +6 other references |
Japan (TL) | |
| Nambu et al. (1967) +1 other reference |
| - (n.d.) +1 other reference | |
| Nambu et al. (1980) |
| - (n.d.) +1 other reference |
| Nambu et al. (1980) |
| - (n.d.) |
| Powder XRD by John Attard +1 other reference |
Mexico | |
| Minera Autlan |
Portugal | |
| Idoia Garate-Olabe et al. (Guarda, Portugal) |
Romania | |
| minerals-of-the-carpathians.eu (2008) |
| Hîrtopanu (1997) +1 other reference |
Russia | |
| Igor Savin's data |
| Kasatkin et al. (2021) |
South Africa | |
| Cairncross et al. (1995) +2 other references |
| Willy Israel and Clement Smith ... | |
Spain | |
| Jorge et al. (2005) |
USA | |
| Anthony et al. (1995) |
| Anthony et al. (1995) |
| Econ Geol (1985) |
| Carnein et al. (2005) | |
| Mike Scott S106121 from Cureton 1990 ID ... |
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Smartt Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa