Kamiokite
A valid IMA mineral species
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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
GUID
(UUID V4):
(UUID V4):
ce077827-3972-4789-b071-c84a42b782b0
IMA Classification of Kamiokite
Approved
IMA Formula:
Fe2+2Mo4+3O8
Approval year:
1975
First published:
1977
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 |
|---|---|---|
| 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
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
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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) |
|---|---|---|---|---|---|---|---|
| 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 | |
| 0010022 | Kamiokite | Kanazawa Y, Sasaki A (1986) Structure of kamiokite Acta Crystallographica C42 9-11 | | 1986 | Kamioka mine, Gifu Prefecture, Japan | 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:
Reference:
Picot, D., Johan, Z. (1977) Kamiokite. Atlas des Minéraux Métalliques. Mémoires du Bureau de Recherches Géologiques et Minières: 90-1977: 219-219.
Synonyms of Kamiokite
Other Language Names for Kamiokite
Relationship of Kamiokite to other Species
Member of:
Other Members of this group:
| Iseite | Mn2Mo3O8 | Hex. 6mm : P63mc |
| Majindeite | Mg2Mo3O8 | Hex. 6mm : P63mc |
Common Associates
Associated Minerals Based on Photo Data:
| 3 photos of Kamiokite associated with Molybdenite | MoS2 |
| 2 photos of Kamiokite associated with Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| 2 photos of Kamiokite associated with Fluorite | CaF2 |
| 2 photos of Kamiokite associated with Ilsemannite | Mo3O8 · nH2O |
Related Minerals - Strunz-mindat Grouping
| 4.CB. | Ferrohögbomite-2N2S | [(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2 |
| 4.CB. | Magnesiohögbomite-6N12S | Mg5Al11TiO23(OH) |
| 4.CB. | Zhenruite | (MoO3)2 · H2O |
| 4.CB. | Pengite | (Pb8Sb3+3)Σ11Sb5+9O35 |
| 4.CB. | Virgilluethite | MoO3 · H2O |
| 4.CB.05 | Brizziite | NaSb5+O3 |
| 4.CB.05 | Corundum | Al2O3 |
| 4.CB.05 | Ecandrewsite | (Zn,Fe2+,Mn2+)TiO3 |
| 4.CB.05 | Eskolaite | Cr2O3 |
| 4.CB.05 | Geikielite | MgTiO3 |
| 4.CB.05 | Hematite | Fe2O3 |
| 4.CB.05 | Ilmenite | Fe2+TiO3 |
| 4.CB.05 | Karelianite | V3+2O3 |
| 4.CB.05 | Melanostibite | Mn2+2Fe3+Sb5+O6 |
| 4.CB.05 | Pyrophanite | Mn2+TiO3 |
| 4.CB.05 | Akimotoite | (Mg,Fe2+)SiO3 |
| 4.CB.05 | Auroantimonate | AuSbO3 |
| 4.CB.05 | UM1998-11-O-AuHSb | Au+2Sb3+O2(OH) |
| 4.CB.05 | Tistarite | Ti3+2O3 |
| 4.CB.05 | Unnamed (Fe-Cr Oxide) | FeCrO3 |
| 4.CB.05 | Hemleyite | (Fe2+0.48Mg0.37Ca0.04Na0.04Mn2+0.03Al0.03Cr3+0.01)sum=1.00Si1.00O3 |
| 4.CB.10 | Avicennite | Tl2O3 |
| 4.CB.10 | Bixbyite-(Mn) | Mn3+2O3 |
| 4.CB.10 | Bixbyite-(Fe) | (Fe,Mn)2O3 |
| 4.CB.15 | Armalcolite | (Mg,Fe2+)Ti2O5 |
| 4.CB.15 | Sassite | Ti3+2Ti4+O5 |
| 4.CB.15 | Pseudobrookite | Fe2TiO5 |
| 4.CB.15 | Ferropseudobrookite | Fe2+Ti2O5 |
| 4.CB.15 | Griffinite | Al2TiO5 |
| 4.CB.15 | Pseudobrookite Group | |
| 4.CB.20 | Zincohögbomite-2N2S | [(Zn,Al,Fe2+)3(Al,Fe3+,Ti)8O15(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 | Magnesiohögbomite-2N4S | (Mg8.43Fe2+1.57)sum=10Al22Ti4+2O46(OH)2 |
| 4.CB.20 | Magnesiobeltrandoite-2N3S | (Mg6Al2)(Al18Fe3+2)O38(OH)2 |
| 4.CB.20 | Zincovelesite-6N6S | Zn3(Fe3+,Mn3+,Al,Ti)8O15(OH) |
| 4.CB.25 | Pseudorutile | Fe2Ti3O9 |
| 4.CB.25 | Kleberite | FeTi6O11(OH)5 |
| 4.CB.30 | Berdesinskiite | V3+2TiO5 |
| 4.CB.30 | Oxyvanite | V3+2V4+O5 |
| 4.CB.30 | Kaitianite | Ti3+2Ti4+O5 |
| 4.CB.35 | Olkhonskite | (Cr,V)2Ti3O9 |
| 4.CB.35 | Schreyerite | V3+2Ti3O9 |
| 4.CB.35 | Machiite | Al2Ti3O9 |
| 4.CB.35 | Vestaite | (Ti4+Fe2+)Ti4+3O9 |
| 4.CB.40 | Nolanite | V3+8Fe3+2O14(OH)2 |
| 4.CB.40 | Rinmanite | Zn2Sb2Mg2Fe4O14(OH)2 |
| 4.CB.40 | Iseite | Mn2Mo3O8 |
| 4.CB.40 | Majindeite | Mg2Mo3O8 |
| 4.CB.45 | Claudetite | As2O3 |
| 4.CB.45 | Stibioclaudetite | AsSbO3 |
| 4.CB.50 | Arsenolite | As2O3 |
| 4.CB.50 | Senarmontite | Sb2O3 |
| 4.CB.55 | Valentinite | Sb2O3 |
| 4.CB.60 | Bismite | Bi2O3 |
| 4.CB.65 | Sphaerobismoite | Bi2O3 |
| 4.CB.70 | Sillénite | Bi12SiO20 |
| 4.CB.75 | Kyzylkumite | V3+Ti2O5(OH) |
| 4.CB.80 | Tietaiyangite | Fe3+4Fe2+TiO9 |
| 4.CB.85 | Liuite | FeTiO3 |
| 4.CB.90 | Luogufengite | Fe2O3 |
| 4.CB.95 | Wangdaodeite | FeTiO3 |
Other Information
Notes:
Slowly etched by nitric acid, not affected by hydrochloric
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Kamiokite
mindat.org URL:
https://www.mindat.org/min-2147.html
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References for Kamiokite
Localities for Kamiokite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Brazil | |
| Johan et al. (1986) |
China | |
| Han et al. (2014) |
Czech Republic | |
| Sejkora +1 other reference |
Japan (TL) | |
| Sasaki et al. (1985) |
Mexico | |
| 72nd Meteor.Soc. Meeting (2009) |
Russia | |
| Yu. Engalychev (2019) |
USA | |
| American Mineralogist |
| American Mineralogist |
| Wolff et al. (2014) |
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