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Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka Village (Iisaka), Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan

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Latitude & Longitude (WGS84): 37° 40' North , 140° 37' East
Latitude & Longitude (decimal): 37.66667,140.61667
Köppen climate type:Cfa : Humid subtropical climate

A pegmatite shaped like a vertical pipe of 60m diameter. Worked for its major components (perthitic feldspar and quartz) for the ceramic industry. Unusually rich in yttrium-bearing minerals.
The largest pegmatite body in an area rich in other pegmatites.
Mining started in 1916 and closed in the early 1980s.
According to Hori et al. (2006) Iizaka (Iisaka) Village is the old locality name; the pegmatite is near Kawamata town.

Mineral List

35 valid minerals. 2 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: this is a very new system on and data is currently VERY limited. Please bear with us while we work towards adding this information!

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

66 - 252.17 Ma

ID: 1380514
Mesozoic plutonic rocks

Age: Mesozoic (66 - 252.17 Ma)

Comments: Deep-seated to high-level intrusions are included. Many charnockites, anorthosites, and large ophiolites, classified as plutons, are distinguished in the database using the SIGNIF item. Ophiolites were classified as plutons, even where remnants may be extrusive and/or sedimentary.

Lithology: Plutonic rocks

Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. [18]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on 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 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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hasegawa (1957), Sci. Rept. Tohoku University, Third series: 5: 345-371.
Kozo Nagashim & Akira Kato (1966) Chemical Studies of Minerals Containing Rarer Elements from the Far East District. LX. Thalenite from Suishoyama, Kawamata-machi, Fukushima Prefecture, Japan Bulletin of the Chemical Society of Japan 39:925-928
Hori, H., Kobayashi, T., Miyawaki, R., Matsubara, S., Yokoyama, K., Shimizu, M. (2006): Iwashiroite-(Y), YTaO4, a new mineral from Suishoyama, Kawamata Town, Fukushima Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 101, 170-177.
Hoshino, M., Kimata, M., Shimizu, M., Nishida, N., and Fujiwara, T. (2006) Allanite-(Ce) in granitic rocks from Japan: Genetic implications of patterns of REE and Mn enrichment. Canadian Mineralogist: 44: 45-62.
Miyawaki, Ritsuro, Kuriyama, Junko, and Naki, Izumi, 1993, The redefinition of tengerite- (Y) , Y2(CO3)3.2-3H2O, and its crystal structure, American Mineralogist, 78: 425-432.

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