Manjiroite Mineral Data (original) (raw)

General Manjiroite Information

Help on Chemical Formula: Chemical Formula:

(Na,K)(Mn++++,Mn++)8O16•n(H2O)

Help on Composition: Composition:

Molecular Weight = 739.94 gm

Potassium 1.06 % K 1.27 % K2O

Sodium 2.17 % Na 2.93 % Na2O

Manganese 57.91 % Mn 2.88 % MnO / 88.12 % MnO2

Aluminum 0.36 % Al 0.69 % Al2O3

Hydrogen 0.44 % H 3.90 % H2O

Oxygen 38.06 % O

______ ______

100.00 % 99.78 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Na0.7K0.2Mn4+7.5Mn2+0.3Al0.1O16•1.6(H2O)

Help on Environment: Environment:

Oxidation zone of metamorphosed bedded manganese deposits.

Help on IMA Status: IMA Status:

Approved IMA 1967

Help on Locality: Locality:

Kohare, Tachikawa, Kotamagawa, Kawai, and Takinosawa mines, Iwate Prefecture, Japan. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Manjiro Watanabe (1891-?), Emeritus Professor of Mineralogy, Tohoku University, Sendai, Japan.

Help on Name Pronunciation: Name Pronunciation:

Manjiroite + Pronunciation Say MANJIROITE

Manjiroite Image

Click Here for Larger Manjiroite Image in a New Browser Window Images:

Click Here for Larger Manjiroite Image Manjiroite Comments: Dark brownish black massive sample of manjiroite. Location: Arizona, USA.Scale: 3.8 X 5.6 cm. © John Veevaert

Manjiroite Crystallography

Help on Axial Ratios: Axial Ratios:

a:c = 1:0.28882

Help on Cell Dimensions: Cell Dimensions:

a = 9.916, c = 2.864, Z = 1; V = 281.61 Den(Calc)= 4.36

Help on Crystal System: Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4/m

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.406(1), 7.017(0.98), 3.136(0.92),

Physical Properties of Manjiroite

Help on Cleavage: Cleavage:

None

Help on Color: Color:

Brownish gray, Gray brown, Dark brown gray.

Help on Density: Density:

4.29

Help on Diaphaneity: Diaphaneity:

Opaque

Help on Fracture: Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Help on Habit: Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Help on Hardness: Hardness:

7 - Quartz

Help on Luster: Luster:

Earthy (Dull)

Help on Streak: Streak:

brownish black

Optical Properties of Manjiroite

Help on Optical Data: 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

Calculated Properties of Manjiroite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=4.15 gm/cc
note: Specific Gravity of Manjiroite =4.36 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.0001845889
Boson Index = 0.9998154111

Help on Photoelectric: Photoelectric:

PEManjiroite = 15.26 barns/electron
U=PEManjiroite x relectron= 63.28 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 14.49 (Gamma Ray American Petroleum Institute Units)
Concentration of Manjiroite per GRapi unit = 6.90 (%)

Estimated Radioactivity from Manjiroite - barely detectable

Manjiroite Classification

Help on Dana Class: Dana Class:

07.09.01.03 (07)Multiple Oxides

(07.09)Dana Type

(07.09.01)Cryptomelane Group (Hard black, fine-grained)

07.09.01.01 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

07.09.01.02 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

07.09.01.03 Manjiroite (Na,K)(Mn,Mn)8O16•n(H2O) I 4/m 4/m

07.09.01.04 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

07.09.01.05 Strontiomelane! SrMn6Mn2O16 P 21/m 2/m

07.09.01.06 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

Help on Strunz Class: Strunz Class:

04.DK.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DK -With large (� medium-sized) cations; tunnel structures

04.DK.05 Akaganeite Fe(O,OH,Cl) I2/m 2/m

04.DK.05 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m

04.DK.05 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

04.DK.05 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

04.DK.05 Manjiroite (Na,K)(Mn,Mn)8O16•n(H2O) I 4/m 4/m

04.DK.05 Mannardite BaTi6V2O16•(H2O) I 41/a 4/m

04.DK.05 Redledgeite BaTi6Cr2O16•(H2O) I 41/a 4/m

04.DK.05 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m

04.DK.05 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

Other Manjiroite Information

Help on References: References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

Help on See Also: 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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Ask about Manjiroite here :
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Print or Cut-and-Paste your Manjiroite Specimen Label here :

Manjiroite

(Na,K)(Mn++++,Mn++)8O16•n(H2O)
Dana No: 07.09.01.03 Strunz No: 04.DK.05
Locality:

Notes: