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Okutama mine, Okutama-cho, Nishitama district, Tokyo, Japani
Regional Level Types
Okutama mineMine
Okutama-cho- not defined -
Nishitama districtDistrict
TokyoPrefecture
JapanCountry

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Latitude & Longitude (WGS84):
35° 48' 23'' North , 139° 6' 15'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Ōme149,323 (2017)12.7km
Itsukaichi24,954 (2017)13.6km
Hannō86,262 (2017)19.9km
Chichibu58,507 (2017)20.6km
Uenohara27,840 (2017)21.1km


Weakly metamorphosed sedimentary manganese ore hosted in metachert. Mined during WW2, galleries now inaccessible. Principal ore mineral was caryopilite.

Located east of Okutama station.

Regions containing this locality

AsiaContinent
Okhotsk PlateTectonic Plate
Honshu Island, JapanIsland

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


12 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Caryopilite
Formula: Mn2+3Si2O5(OH)4
Reference: Hirata, D. & Kato, A. (1993): Siegenite in a caryopilite ore from the Okutama mine, Tokyo. Bull. Kanagawa prefect. Mus. (Nat. Sci.), No. 22, 25-32.
Ganophyllite
Formula: (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Reference: Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)
'Halloysite'
Formula: Al2(Si2O5)(OH)4
Reference: Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)
Hausmannite
Formula: Mn2+Mn3+2O4
Reference: Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)
Hematite
Formula: Fe2O3
Reference: Alfredo Petrov, field observations, june 2011.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Alfredo Petrov, field observations, june 2011.
'Manganese Oxides'
Reference: Alfredo Petrov, field observations, june 2011.
Manganosite
Formula: MnO
Reference: Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)
Neotocite
Formula: (Mn,Fe,Mg)SiO3 · H2O
Reference: Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)
Pyrite
Formula: FeS2
Reference: Alfredo Petrov, field observations, june 2011.
Quartz
Formula: SiO2
Reference: Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)
Rhodochrosite
Formula: MnCO3
Reference: Hirata, D. & Kato, A. (1993): Siegenite in a caryopilite ore from the Okutama mine, Tokyo. Bull. Kanagawa prefect. Mus. (Nat. Sci.), No. 22, 25-32.
Rhodonite
Formula: Mn2+SiO3
Reference: Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)
Siegenite
Formula: CoNi2S4
Reference: Hirata, D. & Kato, A. (1993): Siegenite in a caryopilite ore from the Okutama mine, Tokyo. Bull. Kanagawa prefect. Mus. (Nat. Sci.), No. 22, 25-32.
Tephroite
Formula: Mn2+2SiO4
Reference: Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Siegenite2.DA.05CoNi2S4
Group 4 - Oxides and Hydroxides
Hausmannite4.BB.10Mn2+Mn3+2O4
Hematite4.CB.05Fe2O3
Manganosite4.AB.25MnO
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Rhodochrosite5.AB.05MnCO3
Group 9 - Silicates
Caryopilite9.ED.15Mn2+3Si2O5(OH)4
Ganophyllite9.EG.30(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
'Halloysite'9.ED.10Al2(Si2O5)(OH)4
Neotocite9.ED.20(Mn,Fe,Mg)SiO3 · H2O
Rhodonite9.DK.05Mn2+SiO3
Tephroite9.AC.05Mn2+2SiO4
Unclassified Minerals, Rocks, etc.
'Limonite'-(Fe,O,OH,H2O)
'Manganese Oxides'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 3:4
Siegenite2.10.1.6CoNi2S4
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
AX
Manganosite4.2.1.3MnO
A2X3
Hematite4.3.1.2Fe2O3
Group 7 - MULTIPLE OXIDES
AB2X4
Hausmannite7.2.7.1Mn2+Mn3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Rhodochrosite14.1.1.4MnCO3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Tephroite51.3.1.4Mn2+2SiO4
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=5
Rhodonite65.4.1.1Mn2+SiO3
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Caryopilite71.1.2b.1Mn2+3Si2O5(OH)4
'Halloysite'71.1.1.4Al2(Si2O5)(OH)4
Neotocite71.1.5.4(Mn,Fe,Mg)SiO3 · H2O
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined islands
Ganophyllite74.1.2.1(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Limonite'-(Fe,O,OH,H2O)
'Manganese Oxides'-

List of minerals for each chemical element

HHydrogen
H CaryopiliteMn32+Si2O5(OH)4
H Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
H Neotocite(Mn,Fe,Mg)SiO3 · H2O
H HalloysiteAl2(Si2O5)(OH)4
H Limonite(Fe,O,OH,H2O)
CCarbon
C RhodochrositeMnCO3
OOxygen
O CaryopiliteMn32+Si2O5(OH)4
O RhodochrositeMnCO3
O RhodoniteMn2+SiO3
O Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
O HausmanniteMn2+Mn23+O4
O TephroiteMn22+SiO4
O Neotocite(Mn,Fe,Mg)SiO3 · H2O
O ManganositeMnO
O QuartzSiO2
O HalloysiteAl2(Si2O5)(OH)4
O Limonite(Fe,O,OH,H2O)
O HematiteFe2O3
NaSodium
Na Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
MgMagnesium
Mg Neotocite(Mn,Fe,Mg)SiO3 · H2O
AlAluminium
Al Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Al HalloysiteAl2(Si2O5)(OH)4
SiSilicon
Si CaryopiliteMn32+Si2O5(OH)4
Si RhodoniteMn2+SiO3
Si Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Si TephroiteMn22+SiO4
Si Neotocite(Mn,Fe,Mg)SiO3 · H2O
Si QuartzSiO2
Si HalloysiteAl2(Si2O5)(OH)4
SSulfur
S SiegeniteCoNi2S4
S PyriteFeS2
KPotassium
K Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
CaCalcium
Ca Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
MnManganese
Mn CaryopiliteMn32+Si2O5(OH)4
Mn RhodochrositeMnCO3
Mn RhodoniteMn2+SiO3
Mn Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Mn HausmanniteMn2+Mn23+O4
Mn TephroiteMn22+SiO4
Mn Neotocite(Mn,Fe,Mg)SiO3 · H2O
Mn ManganositeMnO
FeIron
Fe Neotocite(Mn,Fe,Mg)SiO3 · H2O
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
Fe HematiteFe2O3
CoCobalt
Co SiegeniteCoNi2S4
NiNickel
Ni SiegeniteCoNi2S4

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Mesozoic - Late Paleozoic
66 - 358.9 Ma



ID: 3190221
Paleozoic-Mesozoic sedimentary rocks

Age: Phanerozoic (66 - 358.9 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Hirata, D. & Kato, A. (1993): Siegenite in a caryopilite ore from the Okutama mine, Tokyo. Bull. Kanagawa Prefect. Mus. (Nat. Sci.), No. 22, 25-32.


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