Janggunite Mineral Data + 
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- 6.4.7.1 Janggunite Mn5-x(Mn,Fe)1xO8(OH)6,x=0,2 Unk Ortho
- IV/D.13-10 Janggunite Mn5-x(Mn,Fe)1xO8(OH)6,x=0,2 Unk Ortho
General Janggunite Information |
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 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. | ||
Search for Janggunite Images | |||
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Images:
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Janggunite Crystallography |
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| 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 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 9.34(1), 7.09(0.5), 3.547(0.4), | ||
Physical Properties of Janggunite |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=3.42 gm/cc |
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| Fermion Index |
Fermion Index = 0.00061 Boson Index = 0.99939 |
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| Photoelectric: |
PEJanggunite = 15.36 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Janggunite is Not Radioactive |
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Janggunite Classification |
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| Dana Class: |
6.4.7.1 (6)Hydroxides and Oxides Containing Hydroxyl | ||
| (6.4)containing multiple cations | |||
| (6.4.7)Dana Group | |||
| 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 | |||
Other Janggunite Information |
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| 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 Search for Janggunite using: Visit our Advertisers for Janggunite : Translate Janggunite Mineral Data : Ask about Janggunite here : Print or Cut-and-Paste your Janggunite Specimen Label here :
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