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Iwagi Island, Inland Sea (Setonaikai), Ehime Prefecture, Japani
Regional Level Types
Iwagi IslandIsland
Inland Sea (Setonaikai)Sea
Ehime PrefecturePrefecture
JapanCountry

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Key
Latitude & Longitude (WGS84):
34° 15' 40'' North , 133° 8' 47'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:


Loose blocks of aegirine-syenite in an orange orchard. Collecting prohibited.

Iwagi Islet is the type locality for sugilite, which shows brownish-green to brownish-yellow color and is rich in Fe and poor in Al (Murakami et al., 2020). The Mn2O3 content is negligible. According to the average composition resulting from the analyses performed by Nagashima et al. (2020), the chemical formula is K1.02(Na1.97Ca0.01)61.98(Fe3+1.52Al0.36Ti0.08)61.98Li3.05Si12O30.

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Standard Detailed Strunz Dana Chemical Elements

Mineral List


16 valid minerals. 3 (TL) - type locality of 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!

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Alphabetical List Tree Diagram

Detailed Mineral List:

Aegirine
Formula: NaFe3+Si2O6
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Albite
Formula: Na(AlSi3O8)
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Allanite-(Ce)
Formula: {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Andradite
Formula: Ca3Fe3+2(SiO4)3
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121
Baratovite ?
Formula: KCa7(Ti,Zr)2Li3Si12O36F2
Description: (See note on species page for Katayamalite.)
Reference: Murakami N, Kato T, Hirowatari F (1983) Katayamalite, a new Ca-Li-Ti silicate mineral from Iwagi Islet, Southwest Japan. Mineralogical Journal 11, 261-268; Baur W H, Kassner D (1992) Katayamalite and baratovite are structurally identical. European Journal of Mineralogy 4, 839-841; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Hedenbergite
Formula: CaFe2+Si2O6
Reference: Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Katayamalite (TL)
Formula: KLi3Ca7Ti2(SiO3)12(OH)2
Type Locality:
Reference: Murakami et al. (1983): Mineralogical Journal 11, 261-268; Am. Min. 69, 811-812 (1984); Toshio Kato and Nobuhide Murakami (1985) The crystal structure of katayamalite. Mineralogical Journal 12, #5, 206-217.; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Microcline
Formula: K(AlSi3O8)
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Murakamiite (TL)
Formula: Ca2LiSi3O8(OH)
Type Locality:
Reference: Imaoka, T., Nagashima, M., Kano, T., Kimura, J.-I., Chang, Q. and Fukuda, C. (2016) Murakamiite, IMA 2016-066. CNMNC Newsletter No. 34, December 2016, page 1316; Mineralogical Magazine, 80, 1315–1321; Imaoka, T., Nagashima, M., Kano, T., Kimura, J.-I., Chang, Q., Fukuda, C. (2017): Murakamiite, LiCa2Si3O8(OH), a Li-analogue of pectolite, from the Iwagi Islet, southwest Japan. European Journal of Mineralogy: 29: 1045-1053.
Pectolite
Formula: NaCa2Si3O8(OH)
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Quartz
Formula: SiO2
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Sugilite (TL)
Formula: K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Type Locality:
Reference: Murakami, N., Kato, T., Miura, Y., and Hirowatari, F. (1976) Sugilite, a new silicate mineral from Iwagi Islet, Southwest Japan, Mineralogical Journal, 8, 110–121, https://doi.org/10.2465/minerj.8.110; NJMM (1990), 443; Am Min 84 (1999), 764; Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36; Nagashima, M., Fukuda, C., Matsumoto, T., Imaoka, T., Odicino, G. , and Armellino, G. (2020) Aluminosugilite, KNa2Al2Li3Si12O30, an Al analogue of sugilite, from the Cerchiara mine, Liguria, Italy. European Journal of Mineralogy, 32, 57-66, https://doi.org/10.5194/ejm-32-57-2020
Titanite
Formula: CaTi(SiO4)O
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
Zircon
Formula: Zr(SiO4)
Reference: Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Aegirine9.DA.25NaFe3+Si2O6
Albite9.FA.35Na(AlSi3O8)
Allanite-(Ce)9.BG.05b{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Andradite9.AD.25Ca3Fe3+2(SiO4)3
Baratovite ?9.CJ.25KCa7(Ti,Zr)2Li3Si12O36F2
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Hedenbergite9.DA.15CaFe2+Si2O6
Katayamalite (TL)9.CJ.25KLi3Ca7Ti2(SiO3)12(OH)2
Microcline9.FA.30K(AlSi3O8)
Pectolite9.DG.05NaCa2Si3O8(OH)
Sugilite (TL)9.CM.05K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Titanite9.AG.15CaTi(SiO4)O
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
Murakamiite (TL)-Ca2LiSi3O8(OH)

List of minerals arranged by Dana 8th Edition classification

Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Andradite51.4.3b.1Ca3Fe3+2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
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)
Allanite-(Ce)58.2.1a.1{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Baratovite ?61.1.4.2KCa7(Ti,Zr)2Li3Si12O36F2
Group 63 - CYCLOSILICATES Condensed Rings
Condensed Rings (Milarite - Osumilite group)
Sugilite (TL)63.2.1a.9K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Aegirine65.1.3c.2NaFe3+Si2O6
Hedenbergite65.1.3a.2CaFe2+Si2O6
Single-Width Unbranched Chains, W=1 with chains P=3
Pectolite65.2.1.4aNaCa2Si3O8(OH)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
Katayamalite (TL)-KLi3Ca7Ti2(SiO3)12(OH)2
Murakamiite (TL)-Ca2LiSi3O8(OH)

List of minerals for each chemical element

HHydrogen
H KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
H MurakamiiteCa2LiSi3O8(OH)
H Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
H PectoliteNaCa2Si3O8(OH)
H ApatiteCa5(PO4)3(Cl/F/OH)
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
LiLithium
Li SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Li KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
Li MurakamiiteCa2LiSi3O8(OH)
Li BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
OOxygen
O SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
O KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
O MurakamiiteCa2LiSi3O8(OH)
O AlbiteNa(AlSi3O8)
O AegirineNaFe3+Si2O6
O Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
O AndraditeCa3Fe23+(SiO4)3
O FluorapatiteCa5(PO4)3F
O PectoliteNaCa2Si3O8(OH)
O TitaniteCaTi(SiO4)O
O ZirconZr(SiO4)
O ApatiteCa5(PO4)3(Cl/F/OH)
O MicroclineK(AlSi3O8)
O QuartzSiO2
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O HedenbergiteCaFe2+Si2O6
O BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
FFluorine
F FluorapatiteCa5(PO4)3F
F ApatiteCa5(PO4)3(Cl/F/OH)
F BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
NaSodium
Na SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Na AlbiteNa(AlSi3O8)
Na AegirineNaFe3+Si2O6
Na PectoliteNaCa2Si3O8(OH)
AlAluminium
Al SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Al AlbiteNa(AlSi3O8)
Al Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Al MicroclineK(AlSi3O8)
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SiSilicon
Si SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Si KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
Si MurakamiiteCa2LiSi3O8(OH)
Si AlbiteNa(AlSi3O8)
Si AegirineNaFe3+Si2O6
Si Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Si AndraditeCa3Fe23+(SiO4)3
Si PectoliteNaCa2Si3O8(OH)
Si TitaniteCaTi(SiO4)O
Si ZirconZr(SiO4)
Si MicroclineK(AlSi3O8)
Si QuartzSiO2
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si HedenbergiteCaFe2+Si2O6
Si BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
PPhosphorus
P FluorapatiteCa5(PO4)3F
P ApatiteCa5(PO4)3(Cl/F/OH)
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
K SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
K KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
K MicroclineK(AlSi3O8)
K BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
CaCalcium
Ca KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
Ca MurakamiiteCa2LiSi3O8(OH)
Ca Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ca AndraditeCa3Fe23+(SiO4)3
Ca FluorapatiteCa5(PO4)3F
Ca PectoliteNaCa2Si3O8(OH)
Ca TitaniteCaTi(SiO4)O
Ca ApatiteCa5(PO4)3(Cl/F/OH)
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca HedenbergiteCaFe2+Si2O6
Ca BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
TiTitanium
Ti KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
Ti TitaniteCaTi(SiO4)O
Ti BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
MnManganese
Mn SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
FeIron
Fe SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Fe AegirineNaFe3+Si2O6
Fe Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Fe AndraditeCa3Fe23+(SiO4)3
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe HedenbergiteCaFe2+Si2O6
ZrZirconium
Zr SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Zr ZirconZr(SiO4)
Zr BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
CeCerium
Ce Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Murakami, N., Kato, T., Miura, Y., and Hirowatari, F. (1976) Sugilite, a new silicate mineral from Iwagi Islet, Southwest Japan, Mineralogical Journal, 8, 110–121, https://doi.org/10.2465/minerj.8.110
Murakami, N., Kato, T., Hirowatari, F. (1983) Katayamalite, a new Ca-Li-Ti silicate mineral from Iwagi Islet, Southwest Japan. Mineralogical Journal, 11, 261-268
Imaoka, T., Nagashima, M., Kano, T., Kimura, J.-I., Chang, Q., and Fukuda, C. (2017) Murakamiite, LiCa2Si3O8(OH), a Li-analogue of pectolite, from the Iwagi Islet, southwest Japan. European Journal of Mineralogy, 29, 1045-1053.
Nagashima, M., Fukuda, C., Matsumoto, T., Imaoka, T., Odicino, G. , and Armellino, G. (2020) Aluminosugilite, KNa2Al2Li3Si12O30, an Al analogue of sugilite, from the Cerchiara mine, Liguria, Italy. European Journal of Mineralogy, 32, 57-66, https://doi.org/10.5194/ejm-32-57-2020

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