Janggunite Mineral Data

General Janggunite Information

Chemical Formula:

Mn++++5-x(Mn++,Fe+++)1+xO8(OH)6, x = 0,2

Composition:

Molecular Weight = 559.85 gm

Manganese 56.92 % Mn 12.67 % MnO / 74.54 % MnO₂

Iron 2.00 % Fe 2.85 % Fe₂O₃

Hydrogen 1.08 % H 9.65 % H₂O

Oxygen 40.01 % O

______ ______

100.00 % 99.71 % = TOTAL OXIDE

Empirical Formula:

Mn⁴⁺_4.8Mn²⁺Fe³⁺_0.2O₈(OH)₆

Environment:

In the zone of supergene manganese oxides.

IMA Status:

Approved IMA 1977

Locality:

Janggun mine, Bonghwa, Korea. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Janggunite + Pronunciation

Janggunite Crystallography

Axial Ratios:

a:b:c =0.6636:1:0.5662

Cell Dimensions:

a = 9.324, b = 14.05, c = 7.956, Z = 4; V = 1,042.25 Den(Calc)= 3.57

Crystal System:

Orthorhombic Space Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.34(1), 7.09(0.5), 3.547(0.4),

Physical Properties of Janggunite

Cleavage:

{???} Indistinct

Color:

Black.

Density:

3.59

Diaphaneity:

Opaque

Fracture:

Fragile - Crystals with a delicate and easily injured structure.

Habit:

Colloform - Forming from a gel or colloidal mass.

Habit:

Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite).

Habit:

Flakes - Flat, thin crystals or aggregates.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Earthy (Dull)

Streak:

brownish black

Optical Properties of Janggunite

Optical Data:

Biaxial (?)

NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.3605) where Ncalc=Dcalc*KC+1
NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.3605) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Very strong, bluish or brownish.

RL Color:

Grayish white.

RL Pleochroism:

Distinct, whitish to light gray in oil.

Calculated Properties of Janggunite

Electron Density:

Bulk Density (Electron Density)=3.42 gm/cc
note: Specific Gravity of Janggunite =3.57 gm/cc.

Fermion Index:

Fermion Index = 0.0006166202
Boson Index = 0.9993833798

Photoelectric:

PE_Janggunite= 15.36 barns/electron
U=PE_Janggunite x rElectron Density= 52.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Janggunite is Not Radioactive

Janggunite Classification

Dana Class:

06.04.07.01 (06)Hydroxides and Oxides Containing Hydroxyl

(06.04)containing multiple cations

(06.04.07)Dana Group

06.04.07.01 Janggunite Mn5-x(Mn,Fe)1xO8(OH)6,x=0,2 Unk Ortho

Strunz Class:

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

04.F - Hydroxides (without V or U)

04.FG -Hydroxides with OH, without H2O; unclassified

04.FG.05 Janggunite Mn5-x(Mn,Fe)1xO8(OH)6,x=0,2 Unk Ortho

Other Janggunite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Janggunite :
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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Print or Cut-and-Paste your Janggunite Specimen Label here :

Janggunite

Mn++++5-x(Mn++,Fe+++)1+xO8(OH)6, x = 0,2
Dana No: 06.04.07.01 Strunz No: 04.FG.05
Locality:

Notes:

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