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Cape Ashizuri (Ashizurimisaki), Tosashimizu City, Kochi Prefecture, Shikoku Island, Japan

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 32° North , 132° East (est.)
Margin of Error:~17km
Köppen climate type:Cfa : Humid subtropical climate


Miocene alkaline felsic intrusion (syenite), enriched in F, Li, Nb, Ti, Y, REE, Th, Zn, Ba and Zr. Cut by a peralkaline rhyolite dyke with miarolytic cavities. The occurrence is of interest to economic geologists because of the unusual concentration of some of these elements in an unusual (non-pegmatitic) environment. REE content for example is 453 ppm, the highest of any Japanese granitoid rock.

NOTE: This area is part of Ashizuri-Uwakai National Park, so hammering on rocks by mineral collectors would not be appropriate. (There are also a number of prehistoric megalithic sites here, many of which were deliberately and unforgivably destroyed by park landscapers in 1977.)

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


10 valid minerals.

Detailed Mineral List:

'Alkali Feldspar'
Reference: Kazuo Nakashima and Teruyoshi Imaoka (1998) Mineralogy and Petrology, 63, #1-2, 1-17.
Chevkinite-(Ce)
Formula: (Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
Reference: Teruyoshi Imaoka and Kazuo Nakashima (1994) Neues Jahrbuch fuer Mineralogie (Monatshefte), H8, 358-366.
Columbite-(Fe)
Formula: FeNb2O6
Reference: Kazuo Nakashima and Teruyoshi Imaoka (1998) Mineralogy and Petrology, 63, #1-2, 1-17.
'Fergusonite'
Reference: Kazuo Nakashima and Teruyoshi Imaoka (1998) Mineralogy and Petrology, 63, #1-2, 1-17.
Ferriallanite-(Ce)
Formula: {CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
Reference: Nagashima, M., Imaoka, T., and Nakashima, K. (2011): Crystal chemistry of Ti-rich ferriallanite-(Ce) from Cape Ashizuri, Shikoku Island, Japan. American Mineralogist, 96, 1870-1877.
'Fluocerite'
Reference: Teruyoshi Imaoka and Kazuo Nakashima (1994)(1995?) Neues Jahrbuch fuer Mineralogie, H12, 529-539.
Fluorite
Formula: CaF2
Reference: Kazuo Nakashima and Teruyoshi Imaoka (1998) Mineralogy and Petrology, 63, #1-2, 1-17.
Ilmenite
Formula: Fe2+TiO3
Reference: Kazuo Nakashima and Teruyoshi Imaoka (1998) Mineralogy and Petrology, 63, #1-2, 1-17.
Quartz
Formula: SiO2
Reference: Kazuo Nakashima and Teruyoshi Imaoka (1998) Mineralogy and Petrology, 63, #1-2, 1-17.
Rutile
Formula: TiO2
Reference: Imaoka & Nakajima (1991) Sanko-Gakkai Kou'en-Youshi, 58.
Rutile var: Ilmenorutile
Formula: Fex(Nb,Ta)2x · 4Ti1-xO2
Reference: Imaoka & Nakajima (1991) Sanko-Gakkai Kou'en-Youshi, 58.
Samarskite-(Y)
Formula: (Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Reference: Kazuo Nakashima and Teruyoshi Imaoka (1998) Mineralogy and Petrology, 63, #1-2, 1-17.
Thorite
Formula: Th(SiO4)
Reference: www.eonet.ne.jp/~isinosyuminoyaka/page004.html
Thorite var: Uranothorite
Formula: (Th,U)SiO4
Reference: www.eonet.ne.jp/~isinosyuminoyaka/page004.html
Zircon
Formula: Zr(SiO4)
Reference: Lapiz specimens (Nagoya)

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
'Fluorite'3.AB.25CaF2
Group 4 - Oxides and Hydroxides
'Columbite-(Fe)'4.DB.35FeNb2O6
'Ilmenite'4.CB.05Fe2+TiO3
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
var: Ilmenorutile4.DB.05Fex(Nb,Ta)2x · 4Ti1-xO2
Samarskite-(Y)4.DB.25(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Group 9 - Silicates
'Chevkinite-(Ce)'9.BE.70(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
'Ferriallanite-(Ce)'9.BG.05b{CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
Thorite9.AD.30Th(SiO4)
var: Uranothorite9.AD.30(Th,U)SiO4
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Alkali Feldspar'-
'Fergusonite'-
'Fluocerite'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Rutile4.4.1.1TiO2
var: Ilmenorutile4.4.1.2Fex(Nb,Ta)2x · 4Ti1-xO2
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Samarskite-(Y)8.1.11.1(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
AB2O6
Columbite-(Fe)8.3.2.2FeNb2O6
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Thorite51.5.2.3Th(SiO4)
Zircon51.5.2.1Zr(SiO4)
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
Chevkinite-(Ce)56.2.8.1(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Alkali Feldspar'-
'Fergusonite'-
Ferriallanite-(Ce)-{CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
'Fluocerite'-
Thorite
var: Uranothorite
-(Th,U)SiO4

List of minerals for each chemical element

HHydrogen
H Ferriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
OOxygen
O Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
O Columbite-(Fe)FeNb2O6
O Ferriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
O IlmeniteFe2+TiO3
O Rutile (var: Ilmenorutile)Fex(Nb,Ta)2x · 4Ti1-xO2
O QuartzSiO2
O RutileTiO2
O Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
O ThoriteTh(SiO4)
O Thorite (var: Uranothorite)(Th,U)SiO4
O ZirconZr(SiO4)
FFluorine
F FluoriteCaF2
MgMagnesium
Mg Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
AlAluminium
Al Ferriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
SiSilicon
Si Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
Si Ferriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
Si QuartzSiO2
Si ThoriteTh(SiO4)
Si Thorite (var: Uranothorite)(Th,U)SiO4
Si ZirconZr(SiO4)
CaCalcium
Ca Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
Ca Ferriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
Ca FluoriteCaF2
Ca Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
TiTitanium
Ti Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
Ti IlmeniteFe2+TiO3
Ti Rutile (var: Ilmenorutile)Fex(Nb,Ta)2x · 4Ti1-xO2
Ti RutileTiO2
FeIron
Fe Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
Fe Columbite-(Fe)FeNb2O6
Fe Ferriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
Fe IlmeniteFe2+TiO3
Fe Rutile (var: Ilmenorutile)Fex(Nb,Ta)2x · 4Ti1-xO2
Fe Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
YYttrium
Y Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
ZrZirconium
Zr ZirconZr(SiO4)
NbNiobium
Nb Columbite-(Fe)FeNb2O6
Nb Rutile (var: Ilmenorutile)Fex(Nb,Ta)2x · 4Ti1-xO2
Nb Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
LaLanthanum
La Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
CeCerium
Ce Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
Ce Ferriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
TaTantalum
Ta Rutile (var: Ilmenorutile)Fex(Nb,Ta)2x · 4Ti1-xO2
Ta Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
ThThorium
Th Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8
Th Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Th ThoriteTh(SiO4)
Th Thorite (var: Uranothorite)(Th,U)SiO4
UUranium
U Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
U Thorite (var: Uranothorite)(Th,U)SiO4

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Ishihara Shunso, Tanaka Tsuyoshi, Terashima Shigeru, Togashi Shigeko, Murao Satoshi, Kamioka Hikari (1990): Peralkaline Rhyolite Dikes at the Cape Ashizuri: A New Type of REE and Rare Metal Mineral Resources, Mining Geology, 40, 2 (no. 220), 107-115.
Teruyoshi Imaoka, Kazuo Nakashima, Nobuhide Murakami (1991) Gallium in A-type granites from the Cape Ashizuri, Kochi Prefecture, Southwest Japan. JOURNAL OF MINERALOGY PETROLOGY AND ECONOMIC GEOLOGY, 86(8), 354-363.
Nagashima, M., Imaoka, T. & Nakashima, K. (2011). Crystal chemistry of Ti-rich ferriallanite-(Ce) from Cape Ashizuri, Shikoku Island, Japan. American Mineralogist, 96, 1870-1877.


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