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Janggunite

Formula:
Mn
 
5-x
(Mn,Fe)
 
1+x
O
 
8
(OH)
 
6
System:OrthorhombicColour:black
Hardness:2 - 3
This page provides mineralogical data about Janggunite.

Classification of Janggunite

IMA status:Approved
Strunz 8th edition ID:4/D.13-10
Nickel-Strunz 10th (pending) edition ID:4.FG.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
G : Hydroxides with OH, without H2O; unclassified
Dana 8th edition ID:6.4.7.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
4 : Miscellaneous
Hey's CIM Ref.:7.19.2

7 : Oxides and Hydroxides
19 : Oxides of Mn and Fe
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Type Occurrence of Janggunite

Type Locality:Janggun mine, Bonghwa-gun, Gyeongsangbuk-do (Kyongsang-bukto; Gyeongsangbugdo), South Korea
Year of Discovery:1976

Physical Properties of Janggunite

Lustre:Dull
Colour:black
Streak:brownish black to dark brown
Hardness (Mohs):2 - 3
Hardness Data:Measured
Tenacity:Fragile
Cleavage:Perfect
one direction
Density (measured):3.59 g/cm3
Density (calculated):3.58 g/cm3

Crystallography of Janggunite

Crystal System:Orthorhombic
Cell Parameters:a = 9.324Å, b = 14.05Å, c = 7.956Å
Ratio:a:b:c = 0.664 : 1 : 0.566
Unit Cell Volume:V 1,042.25 ų (Calculated from Unit Cell)
Z:4

Optical Data of Janggunite

Type:Biaxial
Type:Anisotropic
Anisotropism:very strong, yellowish brown with bluish tint
Colour in reflected light:grayish white to gray

Chemical Properties of Janggunite

Formula:
Mn
 
5-x
(Mn,Fe)
 
1+x
O
 
8
(OH)
 
6
Essential elements:H, Mn, O
All elements listed in formula:Fe, H, Mn, O

Relationship of Janggunite to other Species

Related Minerals - Nickel-Strunz Grouping):
4.FG.10Cesàrolite
PbH
 
2
Mn
 
3
O
 
8
4.FG.15Kimrobinsonite
(Ta,Nb)(OH)
 
5-2x
(O,CO
 
3
)
 
x
 x near 1.2
Related Minerals - Hey's Index Grouping:
7.19.1Bixbyite
(Mn
3+
 
,Fe
3+
 
)
 
2
O
 
3
7.19.3Jacobsite
Mn
2+
 
Fe
3+
2
O
 
4
7.19.4Vernadite
(Mn
4+
 
,Fe
3+
 
,Ca,Na)(O,OH)
 
2
 · nH
 
2
O
7.19.5Galaxite
(Mn,Fe,Mg)(Al,Fe)
 
2
O
 
4
7.19.6Filipstadite
(Mn,Mg)
 
2
(Sb
 
.5
Fe
 
.5
)O
 
4
7.19.7Manganochromite
(Mn,Fe)(Cr,V)
 
2
O
 
4
7.19.8Zenzénite
Pb
 
3
(Fe,Mn)
 
4
Mn
 
3
O
 
13

Other Names for Janggunite

Synonyms:
IMA1975-011
German names:
Janggunit
Spanish names:
Janggunita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Janggunite

Reference List:Min. Mag. 41, 519-523(1977)[Am.Min. (1978): 63: 794 (abstract)]

Internet Links for Janggunite

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    Localities for Janggunite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    France
     
    • Provence-Alpes-Côte d'Azur
      • Alpes-Maritimes
        • Guillaumes
          • Daluis
    		[MinRec 32:312]
    South Korea
     
    • Gyeongsangbuk-do (Kyongsang-bukto; Gyeongsangbugdo)
      • Bonghwa-gun
    		J.Korean Inst.Mining Geol.(1975) 8, 117-125
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