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Mt Ohsa (Ohsayama; Osayama), Niimi City, Okayama Prefecture, Japani
Regional Level Types
Mt Ohsa (Ohsayama; Osayama)Mountain
Niimi CityCity
Okayama PrefecturePrefecture
JapanCountry

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PhotosMapsSearch
01319430014948101381325.jpg
Stronalsite, etc.

Mt Ohsa, Niimi City, Okayama Prefecture, Japan
00023310014947476914481.jpg
Stronalsite, etc.

Mt Ohsa, Niimi City, Okayama Prefecture, Japan
07692540014955388928596.jpg
Zircon

Mt Ohsa, Niimi City, Okayama Prefecture, Japan
07298600014947476969658.jpg
Stronalsite, etc.

Mt Ohsa, Niimi City, Okayama Prefecture, Japan
00023310014947476914481.jpg
Stronalsite, etc.

Mt Ohsa, Niimi City, Okayama Prefecture, Japan
07692540014955388928596.jpg
Zircon

Mt Ohsa, Niimi City, Okayama Prefecture, Japan
01319430014948101381325.jpg
Stronalsite, etc.

Mt Ohsa, Niimi City, Okayama Prefecture, Japan
00023310014947476914481.jpg
Stronalsite, etc.

Mt Ohsa, Niimi City, Okayama Prefecture, Japan
Latitude & Longitude (WGS84):
35° 4' 57'' North , 133° 32' 26'' East
Latitude & Longitude (decimal):
35.08275,133.54075
GeoHash:
G#: wynzwf97v
GRN:
N24E78
Type:
Mountain
Köppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Niimi23,787 (2017)12.9km
Takahashi24,819 (2017)34.0km
Tsuyama89,717 (2017)41.8km
Yonago141,368 (2017)43.3km
Kurayoshi48,347 (2017)46.3km
Mindat Locality ID:
19553
Long-form identifier:
mindat:1:2:19553:2
GUID (UUID V4):
fede473e-b83c-4ce4-9088-5c758888df58


Rodingite (metamorphosed basic tuff) xenoliths in serpentine. A scientific monument here is dedicated to a small find of micro kosmochlor crystals, but the outcrop behind the monument has completely disappeared. Nearby are outcrops of unusually pure white jadeite (not cuttable). A 6 x 6 km ultramafic body with chromium-rich minerals.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


29 valid minerals.

Rock Types Recorded

Note: 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:

ⓘ Actinolite
Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
ⓘ Albite
Formula: Na(AlSi3O8)
ⓘ Analcime
Formula: Na(AlSi2O6) · H2O
ⓘ 'Chlorite Group'
ⓘ 'Deweylite'
Formula: Mg4Si3O10 · 6H2O ?
ⓘ Diopside
Formula: CaMgSi2O6
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ 'Ferritchromit'
ⓘ Forsterite
Formula: Mg2SiO4
ⓘ Glaucophane
Formula: ◻[Na2][Mg3Al2]Si8O22(OH)2
ⓘ Grossular
Formula: Ca3Al2(SiO4)3
ⓘ Ilmenite
Formula: Fe2+TiO3
ⓘ Jadeite
Formula: Na(Al,Fe3+)Si2O6
ⓘ Kosmochlor
Formula: NaCrSi2O6
ⓘ Lawsonite
Formula: CaAl2(Si2O7)(OH)2 · H2O
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Muscovite var. Phengite
Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
ⓘ Natrolite
Formula: Na2Al2Si3O10 · 2H2O
ⓘ Omphacite
Formula: (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
ⓘ Pectolite
Formula: NaCa2Si3O8(OH)
ⓘ Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
ⓘ Prehnite
Formula: Ca2Al2Si3O10(OH)2
ⓘ 'Pumpellyite Subgroup'
Formula: Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
ⓘ Rutile
Formula: TiO2
ⓘ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
ⓘ 'Shuiskite Subgroup' ?
Formula: Ca2XCr3+2[Si2O6(OH)][SiO4](OH)2A
ⓘ Spinel
Formula: MgAl2O4
ⓘ Stilpnomelane
Formula: (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
ⓘ Stronalsite
Formula: Na2SrAl4Si4O16
ⓘ Thomsonite-Ca
Formula: NaCa2[Al5Si5O20] · 6H2O
ⓘ Titanite
Formula: CaTi(SiO4)O
ⓘ Tremolite
Formula: ◻Ca2Mg5(Si8O22)(OH)2
ⓘ Uvarovite
Formula: Ca3Cr2(SiO4)3
ⓘ Vesuvianite
Formula: Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
ⓘ Zircon
Formula: Zr(SiO4)

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘSpinel4.BB.05MgAl2O4
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘIlmenite4.CB.05Fe2+TiO3
ⓘRutile4.DB.05TiO2
Group 9 - Silicates
ⓘForsterite9.AC.05Mg2SiO4
ⓘGrossular9.AD.25Ca3Al2(SiO4)3
ⓘUvarovite9.AD.25Ca3Cr2(SiO4)3
ⓘZircon9.AD.30Zr(SiO4)
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘLawsonite9.BE.05CaAl2(Si2O7)(OH)2 · H2O
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘVesuvianite9.BG.35Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
ⓘDiopside9.DA.15CaMgSi2O6
ⓘOmphacite9.DA.20(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
ⓘJadeite9.DA.25Na(Al,Fe3+)Si2O6
ⓘKosmochlor9.DA.25NaCrSi2O6
ⓘTremolite9.DE.10◻Ca2Mg5(Si8O22)(OH)2
ⓘActinolite9.DE.10◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
ⓘGlaucophane9.DE.25◻[Na2][Mg3Al2]Si8O22(OH)2
ⓘPectolite9.DG.05NaCa2Si3O8(OH)
ⓘPrehnite9.DP.20Ca2Al2Si3O10(OH)2
ⓘMuscovite
var. Phengite		9.EC.15KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
ⓘ9.EC.15KAl2(AlSi3O10)(OH)2
ⓘPhlogopite9.EC.20KMg3(AlSi3O10)(OH)2
ⓘStilpnomelane9.EG.40(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
ⓘAlbite9.FA.35Na(AlSi3O8)
ⓘStronalsite9.FA.60Na2SrAl4Si4O16
ⓘNatrolite9.GA.05Na2Al2Si3O10 · 2H2O
ⓘThomsonite-Ca9.GA.10NaCa2[Al5Si5O20] · 6H2O
ⓘAnalcime9.GB.05Na(AlSi2O6) · H2O
Unclassified
ⓘ'Pumpellyite Subgroup'-Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
ⓘ'Deweylite'-Mg4Si3O10 · 6H2O ?
ⓘ'Chlorite Group'-
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4
ⓘ'Ferritchromit'-
ⓘ'Shuiskite Subgroup' ?-Ca2XCr3+2[Si2O6(OH)][SiO4](OH)2A

List of minerals for each chemical element

HHydrogen
Hⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Hⓘ AnalcimeNa(AlSi2O6) · H2O
Hⓘ DeweyliteMg4Si3O10 · 6H2O ?
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ Glaucophane◻[Na2][Mg3Al2]Si8O22(OH)2
Hⓘ LawsoniteCaAl2(Si2O7)(OH)2 · H2O
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ NatroliteNa2Al2Si3O10 · 2H2O
Hⓘ PectoliteNaCa2Si3O8(OH)
Hⓘ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Hⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Hⓘ PrehniteCa2Al2Si3O10(OH)2
Hⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Hⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Hⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Hⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Hⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Hⓘ Serpentine SubgroupD3[Si2O5](OH)4
Hⓘ Shuiskite SubgroupCa2XCr23+[Si2O6(OH)][SiO4](OH)2A
OOxygen
Oⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ AnalcimeNa(AlSi2O6) · H2O
Oⓘ DeweyliteMg4Si3O10 · 6H2O ?
Oⓘ DiopsideCaMgSi2O6
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ ForsteriteMg2SiO4
Oⓘ Glaucophane◻[Na2][Mg3Al2]Si8O22(OH)2
Oⓘ GrossularCa3Al2(SiO4)3
Oⓘ IlmeniteFe2+TiO3
Oⓘ JadeiteNa(Al,Fe3+)Si2O6
Oⓘ KosmochlorNaCrSi2O6
Oⓘ LawsoniteCaAl2(Si2O7)(OH)2 · H2O
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ NatroliteNa2Al2Si3O10 · 2H2O
Oⓘ Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Oⓘ PectoliteNaCa2Si3O8(OH)
Oⓘ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Oⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Oⓘ PrehniteCa2Al2Si3O10(OH)2
Oⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Oⓘ RutileTiO2
Oⓘ SpinelMgAl2O4
Oⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Oⓘ StronalsiteNa2SrAl4Si4O16
Oⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Oⓘ UvaroviteCa3Cr2(SiO4)3
Oⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Oⓘ ZirconZr(SiO4)
Oⓘ Serpentine SubgroupD3[Si2O5](OH)4
Oⓘ Shuiskite SubgroupCa2XCr23+[Si2O6(OH)][SiO4](OH)2A
NaSodium
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ AnalcimeNa(AlSi2O6) · H2O
Naⓘ Glaucophane◻[Na2][Mg3Al2]Si8O22(OH)2
Naⓘ JadeiteNa(Al,Fe3+)Si2O6
Naⓘ KosmochlorNaCrSi2O6
Naⓘ NatroliteNa2Al2Si3O10 · 2H2O
Naⓘ Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Naⓘ PectoliteNaCa2Si3O8(OH)
Naⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Naⓘ StronalsiteNa2SrAl4Si4O16
Naⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
MgMagnesium
Mgⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Mgⓘ DeweyliteMg4Si3O10 · 6H2O ?
Mgⓘ DiopsideCaMgSi2O6
Mgⓘ ForsteriteMg2SiO4
Mgⓘ Glaucophane◻[Na2][Mg3Al2]Si8O22(OH)2
Mgⓘ Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Mgⓘ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Mgⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Mgⓘ SpinelMgAl2O4
Mgⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Mgⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Mgⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
AlAluminium
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ AnalcimeNa(AlSi2O6) · H2O
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ Glaucophane◻[Na2][Mg3Al2]Si8O22(OH)2
Alⓘ GrossularCa3Al2(SiO4)3
Alⓘ JadeiteNa(Al,Fe3+)Si2O6
Alⓘ LawsoniteCaAl2(Si2O7)(OH)2 · H2O
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ NatroliteNa2Al2Si3O10 · 2H2O
Alⓘ Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Alⓘ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Alⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Alⓘ PrehniteCa2Al2Si3O10(OH)2
Alⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Alⓘ SpinelMgAl2O4
Alⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Alⓘ StronalsiteNa2SrAl4Si4O16
Alⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Alⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
SiSilicon
Siⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ AnalcimeNa(AlSi2O6) · H2O
Siⓘ DeweyliteMg4Si3O10 · 6H2O ?
Siⓘ DiopsideCaMgSi2O6
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ ForsteriteMg2SiO4
Siⓘ Glaucophane◻[Na2][Mg3Al2]Si8O22(OH)2
Siⓘ GrossularCa3Al2(SiO4)3
Siⓘ JadeiteNa(Al,Fe3+)Si2O6
Siⓘ KosmochlorNaCrSi2O6
Siⓘ LawsoniteCaAl2(Si2O7)(OH)2 · H2O
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ NatroliteNa2Al2Si3O10 · 2H2O
Siⓘ Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Siⓘ PectoliteNaCa2Si3O8(OH)
Siⓘ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Siⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Siⓘ PrehniteCa2Al2Si3O10(OH)2
Siⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Siⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Siⓘ StronalsiteNa2SrAl4Si4O16
Siⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Siⓘ UvaroviteCa3Cr2(SiO4)3
Siⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Siⓘ ZirconZr(SiO4)
Siⓘ Serpentine SubgroupD3[Si2O5](OH)4
Siⓘ Shuiskite SubgroupCa2XCr23+[Si2O6(OH)][SiO4](OH)2A
KPotassium
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Kⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Kⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
CaCalcium
Caⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Caⓘ DiopsideCaMgSi2O6
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ GrossularCa3Al2(SiO4)3
Caⓘ LawsoniteCaAl2(Si2O7)(OH)2 · H2O
Caⓘ Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Caⓘ PectoliteNaCa2Si3O8(OH)
Caⓘ PrehniteCa2Al2Si3O10(OH)2
Caⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Caⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Caⓘ Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Caⓘ TitaniteCaTi(SiO4)O
Caⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Caⓘ UvaroviteCa3Cr2(SiO4)3
Caⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
Caⓘ Shuiskite SubgroupCa2XCr23+[Si2O6(OH)][SiO4](OH)2A
TiTitanium
Tiⓘ IlmeniteFe2+TiO3
Tiⓘ RutileTiO2
Tiⓘ TitaniteCaTi(SiO4)O
CrChromium
Crⓘ KosmochlorNaCrSi2O6
Crⓘ UvaroviteCa3Cr2(SiO4)3
Crⓘ Shuiskite SubgroupCa2XCr23+[Si2O6(OH)][SiO4](OH)2A
FeIron
Feⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ IlmeniteFe2+TiO3
Feⓘ JadeiteNa(Al,Fe3+)Si2O6
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Feⓘ Muscovite var. PhengiteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Feⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Feⓘ VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
SrStrontium
Srⓘ StronalsiteNa2SrAl4Si4O16
ZrZirconium
Zrⓘ ZirconZr(SiO4)

Other Regions, Features and Areas containing this locality

Amur PlateTectonic Plate
AsiaContinent
Japan

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Toshio Nozaka and Tsugio Shibata (1994) Petrography of primary peridotitesfrom the Ohsa-yama area, Okayama Prefecture. Okayama University Earth Science Report, Vol. 1, No. 1, 1-8.
Hamada, M., Seto, S., Akasaka, M., & Takasu, A. (2008). Chromian pumpellyite and associated chromian minerals from Sangun metamorphic rocks, Osayama, southwest Japan. Journal of Mineralogical and Petrological Sciences, 103(6), 390-399.
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