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Manjiroite Mineral Data
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General Manjiroite Information
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 Chemical Formula: |
(Na,K)(Mn++++,Mn++)8O16•n(H2O) |
| Composition: |
Molecular Weight = 739.94 gm |
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Potassium 1.06 % K 1.27 % K2O |
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Sodium 2.17 % Na 2.93 % Na2O |
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Manganese 57.91 % Mn 2.88 % MnO / 88.12 % MnO2 |
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Aluminum 0.36 % Al 0.69 % Al2O3 |
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Hydrogen 0.44 % H 3.90 % H2O |
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Oxygen 38.06 % O |
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______ ______ |
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100.00 % 99.78 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.7K0.2Mn4+7.5Mn2+0.3Al0.1O16•1.6(H2O) |
| Environment: |
Oxidation zone of metamorphosed bedded manganese deposits. |
| IMA Status: |
Approved IMA 1967 |
| Locality: |
Kohare, Tachikawa, Kotamagawa, Kawai, and Takinosawa mines, Iwate Prefecture, Japan. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Manjiro Watanabe (1891-?), Emeritus Professor of Mineralogy, Tohoku University, Sendai, Japan. |
| Name Pronunciation: |
Manjiroite + Pronunciation  |
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Manjiroite Image |
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Images:
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Manjiroite
Comments: Dark brownish black massive sample of manjiroite.
Location: Arizona, USA.
Scale: 3.8 X 5.6 cm.
© John Veevaert |
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Manjiroite Crystallography
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| Axial Ratios: |
a:c = 1:0.28882 |
| Cell Dimensions: |
a = 9.916, c = 2.864, Z = 1; V = 281.61 Den(Calc)= 4.36 |
| Crystal System: |
Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: I 4/m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.406(1), 7.017(0.98), 3.136(0.92), |
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Physical Properties of Manjiroite
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| Cleavage: |
None |
| Color: |
Brownish gray, Gray brown, Dark brown gray. |
| Density: |
4.29 |
| Diaphaneity: |
Opaque |
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Hardness: |
7 - Quartz |
| Luster: |
Earthy (Dull) |
| Streak: |
brownish black |
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Optical Properties of Manjiroite
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| Optical Data: |
NCalc= 2.64 - from Gladstone-Dale relationship (KC = 0.3756) where Ncalc=Dcalc*KC+1
NCalc= 2.61 - from Gladstone-Dale relationship (KC = 0.3756) where Ncalc=Dmeas*KC+1
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Calculated Properties of Manjiroite
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| Electron Density: |
Bulk Density (Electron Density)=4.15 gm/cc
note: Specific Gravity of Manjiroite =4.36 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0001845889
Boson Index = 0.9998154111 |
| Photoelectric: |
PEManjiroite = 15.26 barns/electron
U=PEManjiroite x relectron= 63.28 barns/cc.
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| Radioactivity: |
GRapi = 14.49 (Gamma Ray American Petroleum Institute Units)
Concentration of Manjiroite per GRapi unit = 6.90 (%)
Estimated Radioactivity from Manjiroite  - barely detectable
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Manjiroite Classification
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| Dana Class: |
07.09.01.03 (07)Multiple Oxides |
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(07.09)Dana Type |
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(07.09.01)Cryptomelane Group (Hard black, fine-grained) |
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07.09.01.01 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m |
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07.09.01.02 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m |
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07.09.01.03 Manjiroite (Na,K)(Mn,Mn)8O16•n(H2O) I 4/m 4/m |
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07.09.01.04 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m |
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07.09.01.05 Strontiomelane! SrMn6Mn2O16 P 21/m 2/m |
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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 |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DK -With large (� medium-sized) cations; tunnel structures |
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04.DK.05 Akaganeite Fe(O,OH,Cl) I2/m 2/m |
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04.DK.05 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m |
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04.DK.05 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m |
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04.DK.05 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m |
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04.DK.05 Manjiroite (Na,K)(Mn,Mn)8O16•n(H2O) I 4/m 4/m |
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04.DK.05 Mannardite BaTi6V2O16•(H2O) I 41/a 4/m |
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04.DK.05 Redledgeite BaTi6Cr2O16•(H2O) I 41/a 4/m |
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04.DK.05 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m |
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04.DK.05 Henrymeyerite! BaFeTi7O16 I 4/m 4/m |
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Other Manjiroite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Manjiroite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Manjiroite
(Na,K)(Mn++++,Mn++)8O16•n(H2O)
Dana No: 07.09.01.03 Strunz No: 04.DK.05
Locality:
Notes:
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