Log In
Kamiokite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Kamiokite
Distant view of Nijyuugoyama and Kamioka adit
Nijuugoyama, Kamioka Mine, Hida City, Gifu Prefecture, Japan
Nijuugoyama, Kamioka Mine, Hida City, Gifu Prefecture, Japan
Formula:
Fe2Mo3O8
Colour:
Black, grey with olive tint in reflected light
Lustre:
Metallic, Sub-Metallic
Hardness:
4½
Specific Gravity:
5.96
Crystal System:
Hexagonal
Member of:
Name:
Named by D. Picot and Z. Johan in 1977 for the type locality, Kamioka mine, Japan.
Isostructural with:
Unique Identifiers
Mindat ID:
2147
Long-form identifier:
mindat:1:1:2147:6
IMA Classification of Kamiokite
Approved
IMA Formula:
Fe2+2Mo4+3O8
Approval year:
1975
First published:
1977
Type description reference:
Classification of Kamiokite
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
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
7.6.3.1
7 : MULTIPLE OXIDES
6 : (AB)5X8
7 : MULTIPLE OXIDES
6 : (AB)5X8
27.3.13
27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates
27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Kmk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Kamiokite
Metallic, Sub-Metallic
Transparency:
Opaque
Colour:
Black, grey with olive tint in reflected light
Streak:
Black
Hardness:
4½ on Mohs scale
Hardness:
VHN50=600 kg/mm2 (15 s test time) - Vickers
Cleavage:
Perfect
on [0001]
on [0001]
Density:
5.96 g/cm3 (Measured) 6.02 g/cm3 (Calculated)
Optical Data of Kamiokite
Type:
Uniaxial (-)
Anisotropism:
Strong - light brownish gray to dark greenish gray
Colour in reflected light:
grey, olive tint
Internal Reflections:
None
Chemistry of Kamiokite
Mindat Formula:
Fe2Mo3O8
Element Weights:
Elements listed:
Crystallography of Kamiokite
Crystal System:
Hexagonal
Class (H-M):
6mm - Dihexagonal Pyramidal
Space Group:
P63mc
Cell Parameters:
a = 5.781(1) Å, c = 10.060(1) Å
Ratio:
a:c = 1 : 1.74
Unit Cell V:
291.16 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0010022 | Kamiokite | Kanazawa Y, Sasaki A (1986) Structure of kamiokite Acta Crystallographica C42 9-11 |  | 1986 | Kamioka mine, Gifu Prefecture, Japan | 0 | 293 |
| 0016631 | Kamiokite | le Page Y, Strobel P (1982) Structure of Iron(II) Molybdenum(IV) Oxide Fe2 Mo3 O8 _cod_database_code 1008752 Acta Crystallographica B38 1265-1267 | | 1982 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.03 Å | (100) |
| 3.55 Å | (90) |
| 2.509 Å | (75b) |
| 2.430 Å | (55) |
| 2.006 Å | (40) |
| 2.785 Å | (35) |
| 1.5678 Å | (35) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Kamiokite
General Appearance of Type Material:
thick tabular hexagonal crystals to 3 mm
Place of Conservation of Type Material:
Geology Museum (Geological Survey of Japan)
Geological Setting of Type Material:
Vein in a skarn
Associated Minerals at Type Locality:
Synonyms of Kamiokite
Other Language Names for Kamiokite
Relationship of Kamiokite to other Species
Member of:
Other Members of Kamiokite Group:
| Iseite | Mn2Mo3O8 | Hex. 6mm : P63mc |
| Majindeite | Mg2Mo3O8 | Hex. 6mm : P63mc |
Common Associates
Associations Based on Photo Data:
| 5 photos of Kamiokite associated with Molybdenite | MoS2 |
| 2 photos of Kamiokite associated with Jordisite | MoS2 |
| 2 photos of Kamiokite associated with Ilsemannite | Mo3O8 · nH2O |
| 2 photos of Kamiokite associated with Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| 2 photos of Kamiokite associated with Fluorite | CaF2 |
| 1 photo of Kamiokite associated with Monipite | MoNiP |
| 1 photo of Kamiokite associated with Tugarinovite | MoO2 |
| 1 photo of Kamiokite associated with 'Apatite' | Ca5(PO4)3A |
| 1 photo of Kamiokite associated with Magnetite | Fe2+Fe3+2O4 |
| 1 photo of Kamiokite associated with Spinel | MgAl2O4 |
Related Minerals - Strunz-mindat Grouping
| 4.CB. | Magnesiohögbomite-6N12S | Mg5Al11TiO23(OH) |
| 4.CB. | Kidodite | BaMg2Fe16O27 |
| 4.CB. | Ferrohögbomite-2N2S | [(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2 |
| 4.CB. | Zhenruite | (MoO3)2 · H2O |
| 4.CB. | Fuyuanite | Mg7Nb6O18(OH)8 |
| 4.CB. | Virgilluethite | MoO3 · H2O |
| 4.CB. | Pengite | (Pb8Sb3+3)Σ11Sb5+9O35 |
| 4.CB.05 | Brizziite | NaSb5+O3 |
| 4.CB.05 | Tistarite | Ti3+2O3 |
| 4.CB.05 | Hematite | Fe2O3 |
| 4.CB.05 | Ecandrewsite | ZnTiO3 |
| 4.CB.05 | Melanostibite | Mn2+2Fe3+Sb5+O6 |
| 4.CB.05 | 'UM1998-11-O-AuHSb' | Au+2Sb3+O2(OH) |
| 4.CB.05 | Karelianite | V3+2O3 |
| 4.CB.05 | Corundum | Al2O3 |
| 4.CB.05 | Eskolaite | Cr2O3 |
| 4.CB.05 | Geikielite | MgTiO3 |
| 4.CB.05 | Akimotoite | MgSiO3 |
| 4.CB.05 | 'Unnamed (Fe-Cr Oxide)' | FeCrO3 |
| 4.CB.05 | 'Auroantimonate' | AuSbO3 |
| 4.CB.05 | Hemleyite | Fe2+SiO3 |
| 4.CB.05 | Ilmenite | Fe2+TiO3 |
| 4.CB.05 | Pyrophanite | Mn2+TiO3 |
| 4.CB.10 | Bixbyite-(Fe) | (Fe,Mn)2O3 |
| 4.CB.10 | Bixbyite-(Mn) | Mn3+2O3 |
| 4.CB.10 | Avicennite | Tl3+2O3 |
| 4.CB.15 | Armalcolite | MgTi4+2O5 |
| 4.CB.15 | Ferropseudobrookite | Fe2+Ti4+2O5 |
| 4.CB.15 | Griffinite | Al2Ti4+O5 |
| 4.CB.15 | Pseudobrookite Group | |
| 4.CB.15 | Sassite | Ti3+2Ti4+O5 |
| 4.CB.15 | Pseudobrookite | Fe3+2Ti4+O5 |
| 4.CB.20 | Zincovelesite-6N6S | Zn3(Fe3+,Mn3+,Al,Ti)8O15(OH) |
| 4.CB.20 | Magnesiohögbomite-2N4S | (Mg8.43Fe2+1.57)Σ=10Al22Ti4+2O46(OH)2 |
| 4.CB.20 | Magnesiobeltrandoite-2N3S | (Mg6Al2)(Al18Fe3+2)O38(OH)2 |
| 4.CB.20 | Zincohögbomite-2N6S | [(Zn,Mg)7(Al,Fe3+,Ti)16O31(OH)]2 |
| 4.CB.20 | Magnesiohögbomite-6N6S | [(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6 |
| 4.CB.20 | Magnesiohögbomite-2N3S | [(Mg,Fe2+,Zn)4(Al,Ti,Fe3+)10O19(OH)]2 |
| 4.CB.20 | Magnesiohögbomite-2N2S | [(Mg,Fe2+)3[Al7(Ti,Fe3+)]O15(OH)]2 |
| 4.CB.20 | 'Ferrohögbomite-6N12S' | [(Fe2+,Mg,Zn)5(Al,Ti,Fe3+)12O23(OH)]6 |
| 4.CB.20 | Zincohögbomite-2N2S | [(Zn,Al,Fe2+)3(Al,Fe3+,Ti)8O15(OH)]2 |
| 4.CB.25 | Kleberite | FeTi6O11(OH)5 |
| 4.CB.25 | Pseudorutile | Fe3+2Ti4+3O9 |
| 4.CB.30 |
Vrchoslav fluorite deposit, Vrchoslav, Krupka, Teplice District, Ústí nad Labem Region, Czech Republic