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Kamiokite

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Formula:
Fe
 
2
Mo
 
3
O
 
8
System:HexagonalColour:Black, grey with olive ...
Lustre:Metallic, Sub-MetallicHardness:
Member of:Kamiokite Group
Name:Named after its type locality mine.
Isostructural with:Iseite


The iron analogue of iseite and majindeite.

Classification of Kamiokite

IMA status:Approved
Strunz 8th edition ID:4/C.07-30
Nickel-Strunz 10th (pending) edition ID:4.CB.40

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
B : With medium-sized cations
Dana 8th edition ID:7.6.3.1

7 : MULTIPLE OXIDES
6 : (AB)5X8
Hey's CIM Ref.:27.3.13

27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates
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Type Occurrence of Kamiokite

Type Locality:Tochibora deposit, Kamioka mine, Hida City, Gifu Prefecture, Chubu Region, Honshu Island, Japan
Place of Conservation of Type Material:Geology Museum (Geological Survey of Japan)
Year of Discovery:1975
Geological Setting of type material:Vein in a skarn

Physical Properties of Kamiokite

Lustre:Metallic, Sub-Metallic
Diaphaneity (Transparency):Opaque
Colour:Black, grey with olive tint in reflected light
Streak:Black
Hardness (Mohs):
Hardness (Vickers):VHN50=600 kg/mm2 (15 s test time)
Cleavage:Distinct/Good
one distinct on [0001]
Density (measured):5.96 g/cm3
Density (calculated):6.02 g/cm3

Crystallography of Kamiokite

Crystal System:Hexagonal
Cell Parameters:a = 5.77Å, c = 10.05Å
Ratio:a:c = 1 : 1.742
Unit Cell Volume:V 289.77 ų (Calculated from Unit Cell)

Optical Data of Kamiokite

Type:Anisotropic
Anisotropism:Strong - light brownish gray to dark greenish gray
Colour in reflected light:grey, olive tint
Internal Reflections:None

Chemical Properties of Kamiokite

Formula:
Fe
 
2
Mo
 
3
O
 
8
Simplified for copy/paste:Fe2Mo3O8
Essential elements:Fe, Mo, O
All elements listed in formula:Fe, Mo, O

Relationship of Kamiokite to other Species

Member of:Kamiokite Group
Other Members of Group:

- +
Iseite
Mn
 
2
Mo
 
3
O
 
8
Majindeite
Mg
 
2
Mo
 
3
O
 
8
Related Minerals - Nickel-Strunz Grouping):

- +
4.CB.05Brizziite
NaSb
5+
 
O
 
3
4.CB.05Corundum
Al
 
2
O
 
3
4.CB.05Ecandrewsite
(Zn,Fe
2+
 
,Mn
2+
 
)TiO
 
3
4.CB.05Eskolaite
Cr
 
2
O
 
3
4.CB.05Geikielite
MgTiO
 
3
4.CB.05Hematite
Fe
 
2
O
 
3
4.CB.05Ilmenite
Fe
2+
 
TiO
 
3
4.CB.05Karelianite
V
3+
2
O
 
3
4.CB.05Melanostibite
Mn
2+
 
(Sb
5+
 
,Fe
3+
 
)O
 
3
4.CB.05Pyrophanite
Mn
2+
 
TiO
 
3
4.CB.05Akimotoite
(Mg,Fe
2+
 
)SiO
 
3
4.CB.05Auroantimonate
AuSbO
 
3
4.CB.05Romanite
(◻,Pb,Ca)UFe
2+
2
(Ti,Fe
3+
 
)
 
6
Ti
 
12
O
 
38
4.CB.05UM1998-11-O-AuHSb
Au
+
2
Sb
3+
 
O
 
2
(OH)
4.CB.05Tistarite
Ti
3+
2
O
 
3
4.CB.10Avicennite
Tl
 
2
O
 
3
4.CB.10Bixbyite
Mn
3+
2
O
 
3
4.CB.15Armalcolite
(Mg,Fe
2+
 
)Ti
 
2
O
 
5
4.CB.15Pseudobrookite
Fe
 
2
TiO
 
5
4.CB.20Zincohögbomite-2N2S
[(Zn,Al,Fe
2+
 
)
 
3
(Al,Fe
3+
 
,Ti)
 
8
O
 
15
(OH)]
 
2
4.CB.20Zincohögbomite-2N6S
[(Zn,Mg)
 
7
(Al,Fe
3+
 
,Ti)
 
16
O
 
31
(OH)]
 
2
4.CB.20Magnesiohögbomite-6N6S
[(Mg,Fe
2+
 
)
 
3
(Al,Ti,Fe
3+
 
)
 
8
O
 
15
(OH)]
 
6
4.CB.20Magnesiohögbomite-2N3S
[(Mg,Fe
2+
 
,Zn)
 
4
(Al,Ti,Fe
3+
 
)
 
10
O
 
19
(OH)]
 
2
4.CB.20Magnesiohögbomite-2N2S
[(Mg,Fe
2+
 
)
 
3
[Al
 
7
(Ti,Fe
3+
 
)]O
 
15
(OH)]
 
2
4.CB.20Ferrohögbomite-6N12S
[(Fe
2+
 
,Mg,Zn)
 
5
(Al,Ti,Fe
3+
 
)
 
12
O
 
23
(OH)]
 
6
4.CB.25Pseudorutile
Fe
 
2
Ti
 
3
O
 
9
4.CB.25Kleberite
FeTi
 
6
O
 
11
(OH)
 
5
4.CB.30Berdesinskiite
V
3+
2
TiO
 
5
4.CB.30Oxyvanite
V
3+
2
V
4+
 
O
 
5
4.CB.35Olkhonskite
(Cr,V)
 
2
Ti
 
3
O
 
9
4.CB.35Schreyerite
V
3+
2
Ti
 
3
O
 
9
4.CB.40Nolanite
(V
3+
 
,Fe
3+
 
,Fe
2+
 
,Ti)
 
10
O
 
14
(OH)
 
2
4.CB.40Rinmanite
Zn
 
2
Sb
 
2
Mg
 
2
Fe
 
4
O
 
14
(OH)
 
2
4.CB.40Iseite
Mn
 
2
Mo
 
3
O
 
8
4.CB.40Majindeite
Mg
 
2
Mo
 
3
O
 
8
4.CB.45Claudetite
As
 
2
O
 
3
4.CB.45Stibioclaudetite
AsSbO
 
3
4.CB.50Arsenolite
As
 
2
O
 
3
4.CB.50Sénarmontite
Sb
 
2
O
 
3
4.CB.55Valentinite
Sb
 
2
O
 
3
4.CB.60Bismite
Bi
 
2
O
 
3
4.CB.65Sphaerobismoite
Bi
 
2
O
 
3
4.CB.70Sillénite
Bi
 
12
SiO
 
20
4.CB.75Kyzylkumite
Ti
 
2
V
3+
 
O
 
5
(OH)
4.CB.80Tietaiyangite
Fe
3+
4
Fe
2+
 
TiO
 
9
Related Minerals - Hey's Index Grouping:

- +
27.3.1Lindgrenite
Cu
 
3
(MoO
 
4
)
 
2
(OH)
 
2
27.3.2Powellite
Ca(MoO
 
4
)
27.3.3Wulfenite
Pb(MoO
 
4
)
27.3.4Koechlinite
Bi
 
2
MoO
 
6
27.3.5Sedovite
U(MoO
 
4
)
 
2
27.3.6Mourite
UMo
 
5
O
 
12
(OH)
 
10
27.3.7Iriginite
(UO
 
2
)Mo
 
2
O
 
7
· 3H
 
2
O
27.3.8Umohoite
(UO
 
2
)MoO
 
4
· 2H
 
2
O
27.3.9Moluranite
H
 
4
U
4+
 
(UO
 
2
)
 
3
(MoO
 
4
)
 
7
· 18H
 
2
O
27.3.10Cousinite
MgU
 
2
Mo
 
2
O
 
11
· 6H
 
2
O
27.3.11Calcurmolite
(Ca,Na)
 
2
(UO
 
2
)
 
3
Mo
 
2
(O,OH)
 
11
· nH
 
2
O
27.3.12Tengchongite
CaO · 6UO
 
3
· 2MoO
 
3
· 12H
 
2
O
27.3.14Ferrimolybdite
Fe
 
2
(MoO
 
4
)
 
3
· nH
 
2
O

Other Names for Kamiokite

Synonyms:
IMA1975-003
Other Languages:
German:Kamiokit
Russian:Камиокит
Spanish:Kamiokita

Other Information

Other Information:Slowly etched by nitric acid, not affected by hydrochloric
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 Kamiokite

Reference List:

- +
Mineral.Journ.Japan (1985) 12, 393-399

American Mineralogist (1983): 68: 1038-1039.

American Mineralogist (1988): 73: 191.

Acta Crystallographica: C42: 9-11.

Internet Links for Kamiokite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Kamiokite details from Handbook of Mineralogy (PDF)
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  • Localities for Kamiokite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (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.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Ústí Region
        • Krušné Hory Mtns (Erzgebirge)
          • Krupka (Graupen)
    Sejkora, J., Breiter, K.: Historický rudní revír Krupka, Krušné hory. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1999, roč. 7, s. 29-45.
    Japan
     
    • Honshu Island
      • Chubu Region
        • Gifu Prefecture
          • Hida City
            • Kamioka mine
    Mineral.Journ.Japan (1985) 12, 393-399
    Mexico
     
    • Chihuahua
      • Pueblito de Allende
    72nd Meteor.Soc. Meeting, Abs. 5090(2009)
    USA
     
    • Michigan
      • Keweenaw Co.
        • Ahmeek
    American Mineralogist,Volume 68, pages1038-1041 1983
        • Mohawk
    American Mineralogist,Volume 68, pages1038-1041 1983
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