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Akaishi mine, Doi, Shikokuchuo City, Ehime Prefecture, Shikoku Island, Japan

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 33° North , 133° East (est.)
Margin of Error:~1km
Locality type:Mine
Köppen climate type:Cfa : Humid subtropical climate


Chromite orebodies, the largest being 50 meters long and 2 meters thick, hosted in serpentine and the neighboring mica schists that were intruded by the serpentine. Used to also produce about 1,000 tons a month of dunite rock, mainly for production of refractories, with minor associated chromium production. Minor eclogite rock is also present.



(See also under "Higashi-Akaishi dunite".)

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


15 valid minerals. 1 (TL) - type locality of valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: Takeo Katou (1921) Journal of the Geological Society of Tokyo, 28, #331.
Calcite
Formula: CaCO3
Reference: Takeo Katou (1921) Journal of the Geological Society of Tokyo, 28, #331.; Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.
Chromio-pargasite (TL)
Formula: {Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
Reference: Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.
Chromite
Formula: Fe2+Cr3+2O4
Reference: Masutomi Museum specimen, Kyoto; Bamba, Takeo (1978) The Alpine Chrome Ores from Japan. Jour. Fac. Sci., Hokkaido Univ., Ser. lV, vol. 18, nos. 1-2, Feb., 1978, 167-179; Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.; Harada, Zyunpéi (1954) Chemical Analyses of Japanese Minerals (III) Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy = 北海道大學理學部紀要, 8(4):289-348
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.
Clinochlore var: Chromian Clinochlore
Formula: Mg5(Al,Cr)2Si3O10(OH)8
Reference: Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.
Diopside
Formula: CaMgSi2O6
Reference: Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.
Diopside var: Chromian Diopside
Formula: Ca(Mg,Cr)Si2O6
Reference: Dr. Kameki Kinoshita collection (curated at Geological Survey of Japan); Dr. Kameki Kinoshita collection (curated at Geological Survey of Japan); Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.
Forsterite
Formula: Mg2SiO4
Reference: Takeo Katou (1921) Journal of the Geological Society of Tokyo, 28, #331.; Bamba, Takeo (1978) The Alpine Chrome Ores from Japan. Jour. Fac. Sci., Hokkaido Univ., Ser. lV, vol. 18, nos. 1-2, Feb., 1978, 167-179
Magnesiochromite
Formula: MgCr2O4
Magnesite
Formula: MgCO3
Reference: Takeo Katou (1921) Journal of the Geological Society of Tokyo, 28, #331.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Takeo Katou (1921) Journal of the Geological Society of Tokyo, 28, #331.
Omphacite
Formula: (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
Reference: Professor Takashi Kitagawa (1949-2009) collection, Hiroshima University.
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Tetsuo Minakawa, et al (2009) JAKOKA: 2009 Annual Meeting of the Japan Association of Mineralogical Sciences, R4-P14; Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.
Pyrope
Formula: Mg3Al2(SiO4)3
Reference: Masutomi Museum specimen, Kyoto
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Reference: Takeo Katou (1921) Journal of the Geological Society of Tokyo, 28, #331.; Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.
Talc
Formula: Mg3Si4O10(OH)2
Reference: Takeo Katou (1921) Journal of the Geological Society of Tokyo, 28, #331.
Uvarovite
Formula: Ca3Cr2(SiO4)3
Reference: Masutomi Museum specimen, Kyoto; Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Magnesiochromite4.BB.05MgCr2O4
Magnetite4.BB.05Fe2+Fe3+2O4
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
Magnesite5.AB.05MgCO3
Group 9 - Silicates
'Actinolite'9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Chromio-pargasite (TL)9.DE.15{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
var: Chromian Clinochlore9.EC.55Mg5(Al,Cr)2Si3O10(OH)8
Diopside9.DA.15CaMgSi2O6
var: Chromian Diopside9.DA.15Ca(Mg,Cr)Si2O6
Forsterite9.AC.05Mg2SiO4
Omphacite9.DA.20(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Pyrope9.AD.25Mg3Al2(SiO4)3
Talc9.EC.05Mg3Si4O10(OH)2
Uvarovite9.AD.25Ca3Cr2(SiO4)3
Unclassified Minerals, Rocks, etc.
Serpentine Subgroup-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Magnesiochromite7.2.3.1MgCr2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Magnesite14.1.1.2MgCO3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Pyrope51.4.3a.1Mg3Al2(SiO4)3
Uvarovite51.4.3b.3Ca3Cr2(SiO4)3
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Omphacite65.1.3b.1(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Talc71.2.1.3Mg3Si4O10(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Unclassified Minerals, Rocks, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Chromio-pargasite (TL)-{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
Clinochlore
var: Chromian Clinochlore
-Mg5(Al,Cr)2Si3O10(OH)8
Diopside
var: Chromian Diopside
-Ca(Mg,Cr)Si2O6
'Serpentine Subgroup'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
H Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
H ClinochloreMg5Al(AlSi3O10)(OH)8
H PhlogopiteKMg3(AlSi3O10)(OH)2
H Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
H TalcMg3Si4O10(OH)2
CCarbon
C CalciteCaCO3
C MagnesiteMgCO3
OOxygen
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O CalciteCaCO3
O Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
O Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
O Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
O ChromiteFe2+Cr23+O4
O ClinochloreMg5Al(AlSi3O10)(OH)8
O DiopsideCaMgSi2O6
O ForsteriteMg2SiO4
O MagnesiochromiteMgCr2O4
O MagnesiteMgCO3
O MagnetiteFe2+Fe23+O4
O Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
O PhlogopiteKMg3(AlSi3O10)(OH)2
O PyropeMg3Al2(SiO4)3
O Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
O TalcMg3Si4O10(OH)2
O UvaroviteCa3Cr2(SiO4)3
NaSodium
Na Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
Na Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
MgMagnesium
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Mg Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Mg Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg DiopsideCaMgSi2O6
Mg ForsteriteMg2SiO4
Mg MagnesiochromiteMgCr2O4
Mg MagnesiteMgCO3
Mg Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg PyropeMg3Al2(SiO4)3
Mg Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mg TalcMg3Si4O10(OH)2
AlAluminium
Al Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Al Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al PyropeMg3Al2(SiO4)3
Al Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
SiSilicon
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Si Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Si Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si DiopsideCaMgSi2O6
Si ForsteriteMg2SiO4
Si Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si PyropeMg3Al2(SiO4)3
Si Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Si TalcMg3Si4O10(OH)2
Si UvaroviteCa3Cr2(SiO4)3
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca CalciteCaCO3
Ca Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Ca Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
Ca DiopsideCaMgSi2O6
Ca Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Ca UvaroviteCa3Cr2(SiO4)3
CrChromium
Cr Clinochlore (var: Chromian Clinochlore)Mg5(Al,Cr)2Si3O10(OH)8
Cr Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Cr Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
Cr ChromiteFe2+Cr23+O4
Cr MagnesiochromiteMgCr2O4
Cr UvaroviteCa3Cr2(SiO4)3
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe ChromiteFe2+Cr23+O4
Fe MagnetiteFe2+Fe23+O4
Fe Omphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
Fe Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Takeo Katou (1921) Notes on the banded chromite ore from the Akaishi mine in the province of Iyo, Japan. Journal of the Geological Society of Tokyo, 28, #331.
Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J. I., Saito, S., & Kadota, R. (2012). Ehimeite, NaCa2Mg4CrSi6Al2O22 (OH) 2: The first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107(1), 1-7.


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