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Seikoshi mine (Seigoshi Mine; Seigoushi mine), Toi-cho, Shizuoka, Japani
Regional Level Types
Seikoshi mine (Seigoshi Mine; Seigoushi mine)Mine
Toi-choTown (Former)
ShizuokaPrefecture
JapanCountry

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Key
Latitude & Longitude (WGS84):
34° 54' 0'' North , 138° 49' 37'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Heda3,681 (2017)7.9km
Numazu204,318 (2017)22.5km
Itō71,578 (2017)24.5km
Mishima113,479 (2017)25.4km
Shimoda26,704 (2017)27.1km


A gold and silver mine, worked from 1935 until 1983. The deposit was in altered volcanic rocks (propylitized Miocene andesite). A roadcut next to the mine was briefly famous for zeolite specimens (including yugawaralite crystals up to 3cm long), but is now completely covered with concrete to prevent erosion.

Regions containing this locality

AsiaContinent
Philippine Sea PlateTectonic Plate
Honshu Island, JapanIsland

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


21 valid minerals.

Detailed Mineral List:

Acanthite
Formula: Ag2S
Reference: Dr. Kameki Kinoshita collection (curated at Geological Survey of Japan); Econ Geol (1985) 80:1415-1424; Naotatsu Shikazono & Masaaki Shimizu (1988) Electrum: Chemical composition, Mode of occurrence, and Depositional environment. Bull 32 The University Museum, The University of Tokyo
Beidellite
Formula: (Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Reference: The Mineral Species of Japan (5th ed) Matsubara
Calcite
Formula: CaCO3
Reference: Aoki, M. & Minato, H. (1980) Lattice constants of Wairakite as a function of chemical composition. American Mineralogist, 65, 1212-1216; Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
'Chabazite'
Reference: Aoki, M. & Minato, H. (1980) Lattice constants of Wairakite as a function of chemical composition. American Mineralogist, 65, 1212-1216
Chalcopyrite
Formula: CuFeS2
Reference: Naotatsu Shikazono & Masaaki Shimizu (1988) Electrum: Chemical composition, Mode of occurrence, and Depositional environment. Bull 32 The University Museum, The University of Tokyo; Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
'Chlorite Group'
'Electrum'
Formula: (Au, Ag)
Reference: Econ Geol (1985) 80:1415-1424; Naotatsu Shikazono & Masaaki Shimizu (1988) Electrum: Chemical composition, Mode of occurrence, and Depositional environment. Bull 32 The University Museum, The University of Tokyo
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Aoki, M. & Minato, H. (1980) Lattice constants of Wairakite as a function of chemical composition. American Mineralogist, 65, 1212-1216
Gold
Formula: Au
Reference: Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
'Heulandite subgroup'
Reference: Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
Inesite
Formula: Ca2(Mn,Fe)7Si10O28(OH)2 · 5H2O
Reference: Dr. Matsuo Nambu collection (curated at Geological Survey of Japan)
'K Feldspar'
Reference: Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Reference: Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Reference: Aoki, M. & Minato, H. (1980) Lattice constants of Wairakite as a function of chemical composition. American Mineralogist, 65, 1212-1216
Mordenite
Formula: (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Pearceite
Formula: [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
Reference: Dr. Kameki Kinoshita collection (curated at Geological Survey of Japan)
Polybasite
Formula: [(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Reference: Dr. Kameki Kinoshita collection (curated at Geological Survey of Japan)
Polybasite-Tac
Reference: Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
Pyrargyrite
Formula: Ag3SbS3
Reference: Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
Pyrite
Formula: FeS2
Reference: Econ Geol (1985) 80:1415-1424
Quartz
Formula: SiO2
Reference: Aoki, M. & Minato, H. (1980) Lattice constants of Wairakite as a function of chemical composition. American Mineralogist, 65, 1212-1216
Scolecite
Formula: CaAl2Si3O10 · 3H2O
Reference: Aoki, M. & Minato, H. (1980) Lattice constants of Wairakite as a function of chemical composition. American Mineralogist, 65, 1212-1216
Silver
Formula: Ag
Reference: Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
Sphalerite
Formula: ZnS
Reference: Econ Geol (1985) 80:1415-1424; Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.; Makoto Watanabe (1983) Journal of Science of the Hiroshima University, Series C, 8, #1, 67-94.
Stellerite
Formula: Ca4(Si28Al8)O72 · 28H2O
'Stilbite subgroup'
Reference: Aoki, M. & Minato, H. (1980) Lattice constants of Wairakite as a function of chemical composition. American Mineralogist, 65, 1212-1216
Wairakite
Formula: Ca(Al2Si4O12) · 2H2O
Reference: Yotaro Seki (1973) Distribution and Modes of Occurrence of Wairakites in the Japanese Island Arc The Journal of the Geological Society of Japan 79:521-527; Aoki, M. & Minato, H. (1980) Lattice constants of Wairakite as a function of chemical composition. American Mineralogist, 65, 1212-1216
Yugawaralite
Formula: CaAl2Si6O16 · 4H2O
Reference: [MinRec 8:517]; Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Electrum'1.AA.05(Au, Ag)
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Chalcopyrite2.CB.10aCuFeS2
Pearceite2.GB.15[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
Polybasite2.GB.15[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Pyrargyrite2.GA.05Ag3SbS3
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Beidellite9.EC.40(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Inesite9.DL.05Ca2(Mn,Fe)7Si10O28(OH)2 · 5H2O
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Mordenite9.GD.35(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Scolecite9.GA.05CaAl2Si3O10 · 3H2O
Stellerite9.GE.15Ca4(Si28Al8)O72 · 28H2O
Wairakite9.GB.05Ca(Al2Si4O12) · 2H2O
Yugawaralite9.GB.15CaAl2Si6O16 · 4H2O
Unclassified Minerals, Rocks, etc.
'Chabazite'-
'Chlorite Group'-
'Heulandite subgroup'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
Polybasite-Tac-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
AmXp, with m:p = 1:1
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
ø > 4
Pearceite3.1.8.1[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
Polybasite3.1.7.2[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
ø = 3
Pyrargyrite3.4.1.2Ag3SbS3
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Ca-Na subgroup
Inesite66.3.3.1Ca2(Mn,Fe)7Si10O28(OH)2 · 5H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 clays
Beidellite71.3.1a.1(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Mordenite77.1.6.1(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Scolecite77.1.5.5CaAl2Si3O10 · 3H2O
Stellerite77.1.4.4Ca4(Si28Al8)O72 · 28H2O
Wairakite77.1.1.3Ca(Al2Si4O12) · 2H2O
Yugawaralite77.1.7.2CaAl2Si6O16 · 4H2O
Unclassified Minerals, Mixtures, etc.
'Chabazite'-
'Chlorite Group'-
'Electrum'-(Au, Ag)
'Heulandite subgroup'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
Polybasite-Tac-
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H YugawaraliteCaAl2Si6O16 · 4H2O
H LaumontiteCaAl2Si4O12 · 4H2O
H WairakiteCa(Al2Si4O12) · 2H2O
H Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
H ScoleciteCaAl2Si3O10 · 3H2O
H StelleriteCa4(Si28Al8)O72 · 28H2O
H Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
H InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2O
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
CCarbon
C CalciteCaCO3
OOxygen
O YugawaraliteCaAl2Si6O16 · 4H2O
O K Feldspar (var: Adularia)KAlSi3O8
O LaumontiteCaAl2Si4O12 · 4H2O
O WairakiteCa(Al2Si4O12) · 2H2O
O Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
O ScoleciteCaAl2Si3O10 · 3H2O
O StelleriteCa4(Si28Al8)O72 · 28H2O
O CalciteCaCO3
O QuartzSiO2
O Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
O InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2O
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
NaSodium
Na Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Na Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
AlAluminium
Al YugawaraliteCaAl2Si6O16 · 4H2O
Al K Feldspar (var: Adularia)KAlSi3O8
Al LaumontiteCaAl2Si4O12 · 4H2O
Al WairakiteCa(Al2Si4O12) · 2H2O
Al Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Al ScoleciteCaAl2Si3O10 · 3H2O
Al StelleriteCa4(Si28Al8)O72 · 28H2O
Al Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SiSilicon
Si YugawaraliteCaAl2Si6O16 · 4H2O
Si K Feldspar (var: Adularia)KAlSi3O8
Si LaumontiteCaAl2Si4O12 · 4H2O
Si WairakiteCa(Al2Si4O12) · 2H2O
Si Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Si ScoleciteCaAl2Si3O10 · 3H2O
Si StelleriteCa4(Si28Al8)O72 · 28H2O
Si QuartzSiO2
Si Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Si InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2O
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SSulfur
S Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
S AcanthiteAg2S
S Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
S SphaleriteZnS
S PyriteFeS2
S ChalcopyriteCuFeS2
S PyrargyriteAg3SbS3
KPotassium
K K Feldspar (var: Adularia)KAlSi3O8
K Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
CaCalcium
Ca YugawaraliteCaAl2Si6O16 · 4H2O
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca WairakiteCa(Al2Si4O12) · 2H2O
Ca Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Ca ScoleciteCaAl2Si3O10 · 3H2O
Ca StelleriteCa4(Si28Al8)O72 · 28H2O
Ca CalciteCaCO3
Ca Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
Ca InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2O
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
MnManganese
Mn InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2O
FeIron
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
CuCopper
Cu Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
Cu Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
AsArsenic
As Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
As Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
AgSilver
Ag Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
Ag AcanthiteAg2S
Ag Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Ag Electrum(Au, Ag)
Ag SilverAg
Ag PyrargyriteAg3SbS3
SbAntimony
Sb Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
Sb Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Sb PyrargyriteAg3SbS3
AuGold
Au Electrum(Au, Ag)
Au GoldAu

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
- Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.


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