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Iki Islands, Iki City, Nagasaki Prefecture, Japan i
Regional Level Types
Iki Islands Group of Islands
Iki City City
Nagasaki Prefecture Prefecture
Japan Country

Regional Level Types
Iki Islands	Group of Islands
Iki City	City
Nagasaki Prefecture	Prefecture
Japan	Country

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Lévyne-Na

Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

Lévyne-Na

Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

Lévyne-Na

Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

Lévyne-Na

Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

Lévyne-Na

Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

Lévyne-Na

Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

Area:

138 km²

Type:

Group of Islands

Age:

23.03 to 0.01143 Ma

Geologic Time:

Cenozoic : Miocene to Pleistocene

Mindat Locality ID:

236050

Long-form identifier:

mindat:1:2:236050:1

GUID (UUID V4):

9569f96c-752c-441f-b549-710619debdf1

Other Languages:

View 14 more...

French:

Iki-no-shima, Iki, Nagasaki, Japon

German:

Iki, Iki, Präfektur Nagasaki, Japan

Japanese:

壱岐島, 壱岐市, 長崎県, 日本

Russian:

Ики, Ики, Нагасаки, Япония

Simplified Chinese:

壹岐島, 壹岐市, 长崎县, 日本

Spanish:

Isla Iki, Iki, prefectura de Nagasaki, Japón

Azeri:

İki adası, Naqasaki, Yaponiya

Belarusian:

Ікі, Нагасакі , Японія

Cebuano:

Ikino Shima, Iki Shi, Nagasaki , Hapon

Estonian:

Iki saar, Iki, Nagasaki prefektuur, Jaapan

Farsi/Persian:

ایکی‌نوشیما, ایکی، ناگازاکی, استان ناگاساکی, ژاپن

Korean:

이키섬, 이키시, 나가사키현, 일본

Lithuanian:

Ikis, Ikis, Nagasakio prefektūra, Japonija

Polish:

Iki, Iki, Prefektura Nagasaki, Japonia

Portuguese:

Ilha Iki, Iki, Nagasaki, Japão

Romanian:

Insula Iki, Iki, Prefectura Nagasaki, Japonia

Swedish:

Ikiöarna, Iki, Nagasaki prefektur, Japan

Traditional Chinese:

壹岐島, 壹岐, 長崎縣, 日本

Turkish:

Iki Adası, Iki, Nagasaki, Japonya

Ukrainian:

Острів Ікі, Ікі, Префектура Наґасакі, Японія

Located off the NW coast of Kyushu the Iki Islands comprise Iki Island itself, covering 140 km² and numerous much smaller subsidiary islands. They are built solely of Miocene-Pleistocene volcanic rocks and are temporally and spatially related to an area of volcanic rocks on the adjacent mainland, where they are seen to overlie granodiorites (Aoki 1959).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

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

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ 'Alkali olivine basalt'

ⓘ Andesite

ⓘ Basalt

ⓘ Dacite

ⓘ 'Peralkaline rhyolite'

ⓘ Rhyolite

ⓘ 'Tholeiitic basalt'

ⓘ Trachyandesite

ⓘ Trachybasalt

ⓘ Trachyte

Detailed Mineral List:

ⓘ Aegirine

Formula: NaFe³⁺Si₂O₆

References:

Aoki, K. I. (1959). Petrology of alkali rocks of the Iki Island and Higashi-matsuura Distinct, Japan. Sci. Rep. Tohoku Univ., Ser III, 6, 261-310.

Woolley, Alan R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe (excluding the former USSR), Australasia and Oceanic Islands. The Geological Society of London. doi:10.1144/mpar4

ⓘ Aegirine-augite

Formula: (Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆

References:

Aoki, K. I. (1959). Petrology of alkali rocks of the Iki Island and Higashi-matsuura Distinct, Japan. Sci. Rep. Tohoku Univ., Ser III, 6, 261-310.

ⓘ 'Chabazite'

Locality: Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ Cowlesite

Formula: CaAl₂Si₃O₁₀ · 6H₂O

Locality: Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ Cristobalite

Formula: SiO₂

Locality: Iki clay deposits, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ Erionite-Na

Formula: (Na₂,K₂,Ca)₂[Al₄Si₁₄O₃₆] · 15H₂O

Locality: Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ 'Fayalite-Forsterite Series'

Locality: Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ Gobbinsite

Formula: Na₅(Si₁₁Al₅)O₃₂ · 11H₂O

Locality: Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ Halloysite

Formula: Al₂(Si₂O₅)(OH)₄

Locality: Iki clay deposits, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ Kaersutite

Formula: NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂

References:

Aoki, K. I. (1959). Petrology of alkali rocks of the Iki Island and Higashi-matsuura Distinct, Japan. Sci. Rep. Tohoku Univ., Ser III, 6, 261-310.

ⓘ Kaolinite

Formula: Al₂(Si₂O₅)(OH)₄

Locality: Iki clay deposits, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ Lévyne-Na (TL)

Formula: (Na₂,Ca,K₂)[Al₂Si₄O₁₂] · 6H₂O

Type Locality:

ⓘ Natrolite

Formula: Na₂Al₂Si₃O₁₀ · 2H₂O

Locality: Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ 'Phillipsite Subgroup'

Locality: Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ Riebeckite

Formula: ◻[Na₂][Fe²⁺₃Fe³⁺₂]Si₈O₂₂(OH)₂

References:

Aoki, K. I. (1959). Petrology of alkali rocks of the Iki Island and Higashi-matsuura Distinct, Japan. Sci. Rep. Tohoku Univ., Ser III, 6, 261-310.

ⓘ 'Stilbite Subgroup'

Formula: M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

Locality: Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

ⓘ Thomsonite-Ca

Formula: NaCa₂[Al₅Si₅O₂₀] · 6H₂O

Locality: Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

Gallery:

(Na₂,Ca,K₂)[Al₂Si₄O₁₂] · 6H₂Oⓘ Lévyne-Na (TL)

Lévyne-Na

Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

Lévyne-Na

Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

Lévyne-Na

Chojabaru, Iki Islands, Iki City, Nagasaki Prefecture, Japan

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Cristobalite	4.DA.15	SiO₂
Group 9 - Silicates
ⓘ	Aegirine-augite	9.DA.20	(Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆
ⓘ	Aegirine	9.DA.25	NaFe³⁺Si₂O₆
ⓘ	Kaersutite	9.DE.15	NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂
ⓘ	Riebeckite	9.DE.25	◻[Na₂][Fe²⁺₃Fe³⁺₂]Si₈O₂₂(OH)₂
ⓘ	Kaolinite	9.ED.05	Al₂(Si₂O₅)(OH)₄
ⓘ	Halloysite	9.ED.10	Al₂(Si₂O₅)(OH)₄
ⓘ	Natrolite	9.GA.05	Na₂Al₂Si₃O₁₀ · 2H₂O
ⓘ	Thomsonite-Ca	9.GA.10	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
ⓘ	Gobbinsite	9.GC.05	Na₅(Si₁₁Al₅)O₃₂ · 11H₂O
ⓘ	Lévyne-Na (TL)	9.GD.15	(Na₂,Ca,K₂)[Al₂Si₄O₁₂] · 6H₂O
ⓘ	Erionite-Na	9.GD.20	(Na₂,K₂,Ca)₂[Al₄Si₁₄O₃₆] · 15H₂O
ⓘ	Cowlesite	9.GG.05	CaAl₂Si₃O₁₀ · 6H₂O
Unclassified
ⓘ	'Phillipsite Subgroup'	-
ⓘ	'Chabazite'	-
ⓘ	'Stilbite Subgroup'	-	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
ⓘ	'Fayalite-Forsterite Series'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Cowlesite	CaAl₂Si₃O₁₀ · 6H₂O
H	ⓘ Gobbinsite	Na₅(Si₁₁Al₅)O₃₂ · 11H₂O
H	ⓘ Halloysite	Al₂(Si₂O₅)(OH)₄
H	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
H	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
H	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
H	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
H	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
H	ⓘ Erionite-Na	(Na₂,K₂,Ca)₂[Al₄Si₁₄O₃₆] · 15H₂O
H	ⓘ Lévyne-Na	(Na₂,Ca,K₂)[Al₂Si₄O₁₂] · 6H₂O
O	Oxygen
O	ⓘ Aegirine	NaFe³⁺Si₂O₆
O	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
O	ⓘ Cowlesite	CaAl₂Si₃O₁₀ · 6H₂O
O	ⓘ Cristobalite	SiO₂
O	ⓘ Gobbinsite	Na₅(Si₁₁Al₅)O₃₂ · 11H₂O
O	ⓘ Halloysite	Al₂(Si₂O₅)(OH)₄
O	ⓘ Kaersutite	NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂
O	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
O	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
O	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
O	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
O	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
O	ⓘ Erionite-Na	(Na₂,K₂,Ca)₂[Al₄Si₁₄O₃₆] · 15H₂O
O	ⓘ Lévyne-Na	(Na₂,Ca,K₂)[Al₂Si₄O₁₂] · 6H₂O
Na	Sodium
Na	ⓘ Aegirine	NaFe³⁺Si₂O₆
Na	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Na	ⓘ Gobbinsite	Na₅(Si₁₁Al₅)O₃₂ · 11H₂O
Na	ⓘ Kaersutite	NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂
Na	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Na	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Na	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Na	ⓘ Erionite-Na	(Na₂,K₂,Ca)₂[Al₄Si₁₄O₃₆] · 15H₂O
Na	ⓘ Lévyne-Na	(Na₂,Ca,K₂)[Al₂Si₄O₁₂] · 6H₂O
Mg	Magnesium
Mg	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Mg	ⓘ Kaersutite	NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂
Al	Aluminium
Al	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Al	ⓘ Cowlesite	CaAl₂Si₃O₁₀ · 6H₂O
Al	ⓘ Gobbinsite	Na₅(Si₁₁Al₅)O₃₂ · 11H₂O
Al	ⓘ Halloysite	Al₂(Si₂O₅)(OH)₄
Al	ⓘ Kaersutite	NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂
Al	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Al	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Al	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Al	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Al	ⓘ Erionite-Na	(Na₂,K₂,Ca)₂[Al₄Si₁₄O₃₆] · 15H₂O
Al	ⓘ Lévyne-Na	(Na₂,Ca,K₂)[Al₂Si₄O₁₂] · 6H₂O
Si	Silicon
Si	ⓘ Aegirine	NaFe³⁺Si₂O₆
Si	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Si	ⓘ Cowlesite	CaAl₂Si₃O₁₀ · 6H₂O
Si	ⓘ Cristobalite	SiO₂
Si	ⓘ Gobbinsite	Na₅(Si₁₁Al₅)O₃₂ · 11H₂O
Si	ⓘ Halloysite	Al₂(Si₂O₅)(OH)₄
Si	ⓘ Kaersutite	NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂
Si	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Si	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Si	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂
Si	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Si	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Si	ⓘ Erionite-Na	(Na₂,K₂,Ca)₂[Al₄Si₁₄O₃₆] · 15H₂O
Si	ⓘ Lévyne-Na	(Na₂,Ca,K₂)[Al₂Si₄O₁₂] · 6H₂O
K	Potassium
K	ⓘ Erionite-Na	(Na₂,K₂,Ca)₂[Al₄Si₁₄O₃₆] · 15H₂O
K	ⓘ Lévyne-Na	(Na₂,Ca,K₂)[Al₂Si₄O₁₂] · 6H₂O
Ca	Calcium
Ca	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Ca	ⓘ Cowlesite	CaAl₂Si₃O₁₀ · 6H₂O
Ca	ⓘ Kaersutite	NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂
Ca	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Ca	ⓘ Erionite-Na	(Na₂,K₂,Ca)₂[Al₄Si₁₄O₃₆] · 15H₂O
Ca	ⓘ Lévyne-Na	(Na₂,Ca,K₂)[Al₂Si₄O₁₂] · 6H₂O
Ti	Titanium
Ti	ⓘ Kaersutite	NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂
Fe	Iron
Fe	ⓘ Aegirine	NaFe³⁺Si₂O₆
Fe	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Fe	ⓘ Riebeckite	◻[Na₂][Fe₃²⁺Fe₂³⁺]Si₈O₂₂(OH)₂

Fossils

There are 2 fossil localities from the PaleoBioDB database within this region.

BETA TEST - These data are provided on an experimental basis and are taken from external databases. Mindat.org has no control currently over the accuracy of these data.

Occurrences

Youngest Fossil Listed

11.6 Ma (Miocene)

Oldest Fossil Listed

16.0 Ma (Miocene)

Stratigraphic Units

Unit	No. Occurrences	Age
Chojabaru	6	15.97 - 13.82 Ma (Miocene)
Iki - Chojabaru	2	15.97 - 11.608 Ma (Miocene)

Fossils from Region

Click here to show the list.

Accepted Name	Hierarchy	Age
Bibio genus	Animalia : Arthropoda : Insecta : Diptera : Bibionidae : *Bibio*	15.97 - 13.82 Ma Miocene
Mycetophilidae family	Animalia : Arthropoda : Insecta : Diptera : Mycetophilidae	15.97 - 13.82 Ma Miocene
Apis lithohermaea species	Animalia : Arthropoda : Insecta : Hymenoptera : Apidae : Apis : *Apis lithohermaea*	15.97 - 13.82 Ma Miocene
Paraphaenogaster avita species	Animalia : Arthropoda : Insecta : Hymenoptera : Formicidae : Paraphaenogaster : *Paraphaenogaster avita*	15.97 - 13.82 Ma Miocene
Terpandrus ikiensis species	Animalia : Arthropoda : Insecta : Orthoptera : Terpandrus : *Terpandrus ikiensis*	15.97 - 13.82 Ma Miocene
Plecia kanetakii species	Animalia : Arthropoda : Insecta : Diptera : Bibionidae : Plecia : *Plecia kanetakii*	15.97 - 13.82 Ma Miocene
Iquius nipponicus species	Animalia : Chordata : Actinopteri : Cypriniformes : Cyprinidae : Iquius : *Iquius nipponicus*	15.97 - 11.608 Ma Miocene
Coreoperca maruoi species	Animalia : Chordata : Actinopteri : Sinipercidae : Coreoperca : *Coreoperca maruoi*	15.97 - 11.608 Ma Miocene

Fossil Localities

Click to show 2 fossil localities

Japan

Nagasaki Prefecture
- Iki City
  - Iki Islands
    - Miocene🐚 Chojabaru-zaki
    - Miocene🐚 Hachiman

Other Databases

Wikipedia:	https://en.wikipedia.org/wiki/Iki_Island
Wikidata ID:	Q494914
GeoNames ID:	1861759

Localities in this Region

Japan

Nagasaki Prefecture
- Iki City
  - Iki Islands
    - Chojabaru
    - Iki clay deposits

Other Regions, Features and Areas that Intersect

Amur PlateTectonic Plate

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

Aoki, K. I. (1959). Petrology of alkali rocks of the Iki Island and Higashi-matsuura Distinct, Japan. Sci. Rep. Tohoku Univ., Ser III, 6, 261-310.

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Mineral List

Rock Types Recorded

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Detailed Mineral List:

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List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Fossils

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Localities in this Region

Other Regions, Features and Areas that Intersect

References

Iki Islands, Iki City, Nagasaki Prefecture, Japan i
Regional Level Types
Iki Islands Group of Islands
Iki City City
Nagasaki Prefecture Prefecture
Japan Country