Janggunite Mineral Data

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.

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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:

OrthorhombicSpace 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

Diaphaniety:

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 (?)

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:

r_electron=3.42 gm/cc
note: r_Janggunite=3.57 gm/cc.

Fermion Index

Fermion Index = 0.00061
Boson Index = 0.99939

Photoelectric:

PE_Janggunite= 15.36 barns/electron
U=PE_Janggunite x r_electron= 52.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Janggunite is Not Radioactive

Janggunite Classification

Dana Class:

6.4.7.1 (6)Hydroxides and Oxides Containing Hydroxyl

(6.4)containing multiple cations

(6.4.7)Dana Group

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

Strunz Class:

IV/D.13-10 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.13 - Janggunite series

IV/D.13-10 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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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: 6.4.7.1 Strunz No: IV/D.13-10
Locality:

Notes: