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

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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.

Refs.:
Hasegawa (1957), Sci. Rept. Tohoku University, Third series: 5: 345-371.
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.





Mineral List:
  		•  Allanite-(Ce)
    {CaCe}{Al
     
    2
    		Fe
    2+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [Hasegawa (1957), Sci. Rept. Tohoku University, Third series: 5: 345-371; Hoshino, et al (2006), Canadian Mineralogist: 44: 45-62.]
  		•  Allanite-(Y)
    {CaY}{Al
     
    2
    		Fe
    2+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [Yamada et al (2004) Koubutsu-Gakkai Kouen-Youshi, 123.]
  		•  Almandine
    Fe
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
    Description: Slightly yttrian bearing
    Reference: [Fluorite: The Collector's Choice. Extra Lapis English No. 9]
  		•  Annite
    KFe
    2+
    3
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [Hori, H. et al (2006): J. Min.Petrol. Sci. 100,170-177]
  		•  Beryl
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
    Reference: []
  		•  Biotite
    Reference: [Geological Survey of Japan, 1970]
  		•  Britholite-(Y) (TL)
    Ca
     
    2
    		(Y,Ca)
     
    3
    		[(OH,F)|(SiO
     
    4
    		,PO
     
    4
    		)
     
    3
    		]
    Type Locality: Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka (Iisaka) Village, Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
    Reference: [Sci. Pap. Inst. Phys. Chem. Res., Tokyo, 34, 1018-1023.]
  		•  Caysichite-(Y)
    Ca
     
    2
    		Y
     
    2
    		Si
     
    4
    		O
     
    10
    		(CO
     
    3
    		)
     
    3
    		·4H
     
    2
    		O
    Reference: [Yamada et al. (2004) [cited in Hori et al. (2006): Iwashiroite-(Y), YTaO4, a new mineral from Suishoyama, Kawamata Town, Fukushima Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 101, 170-177.]
  		•  Fayalite
    Fe
    2+
    2
    		[SiO
     
    4
    		]
    Reference: [Excalibur Mineral company specimens]
  		•  Fluorite
    var: Yttrofluorite
    (Ca
     
    1-x
    		Y
     
    x
    		)F
     
    2+x
    		 where 0.05< x <0.3
    Reference: [Fluorite: The Collector's Choice. Extra Lapis English No. 9]
  		•  Fergusonite-(Y)
    YNbO
     
    4
    Reference: [Alfredo Petrov specimen, from Kotaro Watanabe.]
  		•  'Gadolinite'
    Reference: []
  		•  'Garnet Group'
    X
     
    3
    		Z
     
    2
    		(TO
     
    4
    		)
     
    3
    		 (X = Ca, Fe, etc·, Z = Al, Cr, etc·, T = Si, As, V)
    Reference: [Introduction to Japanese Minerals (Geological Survey of Japan, 1970)]
  		•  Grunerite
    [ ][Fe
    2+
    2
    		][Fe
    2+
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Reference: [Excalibur Mineral company specimens]
  		•  'Gummite
    var: Yttrogummite'
    Reference: [Van King specimen]
    Site Photo
    Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka (Iisaka) Village, Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
    © Van King
  		•  Hingganite-(Y)
    (Y,REE,Ca)
     
    2
    		(□,Fe
    2+
     
    		)Be
     
    2
    		[SiO
     
    4
    		]
     
    2
    		(OH)
     
    2
    Reference: [Toshinori Kobayashi specimen.]
    Site Photo
    Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka (Iisaka) Village, Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
     
  		•  'Hornblende'
    Reference: [Lapis 2002(11), 12]
  		•  Iimoriite-(Y) (TL)
    Y
     
    2
    		[CO
     
    3
    		|SiO
     
    4
    		]
    Type Locality: Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka (Iisaka) Village, Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
    Reference: [Am Min 69:196-199]
    Site Photo
    Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka (Iisaka) Village, Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
     
  		•  Iwashiroite-(Y) (TL)
    Y(Ta,Nb)O
     
    4
    Type Locality: Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka (Iisaka) Village, Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
    Reference: [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.]
    Site Photo
    Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka (Iisaka) Village, Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
     
  		•  'K Feldspar'
    Reference: []
  		•  Magnetite
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
    Reference: [Lapis 2002(11), 12]
  		•  Microcline
    K[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Hori, H. et al (2006): J. Min.Petrol. Sci. 100,170-177]
  		•  'Perthite'
    Reference: [Introduction to Japanese Minerals (Geological Survey of Japan, 1970)]
  		•  Protomangano-ferro-anthophyllite
    ☐[Mn
    2+
    2
    		][Fe
    2+
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Reference: [Am.Min. 84: 196; Lapis 2002(11): 12; Journal of Mineralogical and Petrological Sciences: 97: 127-136.]
    Site Photo
    Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka (Iisaka) Village, Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
     
  		•  Quartz
    SiO
     
    2
    Reference: [Introduction to Japanese Minerals (Geological Survey of Japan, 1970)]
  		•  Synchysite-(Y)
    Ca(Y,Ce)[F|(CO
     
    3
    		)
     
    2
    		]
    Reference: [Kato, A. (1973) Sakurai Koubutsu Hyohon, 38. (Sakurai collection)]
  		•  Tengerite-(Y)
    Y
     
    2
    		[CO
     
    3
    		]
     
    3
    		 · 2-3H
     
    2
    		O
    Reference: [Iimori (1938) Sci. Pap. Inst. Phys. Chem. Res., Tokyo: 34: 832; Fluorite: The Collector's Choice. Extra Lapis English No. 9]
    Site Photo
    Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka (Iisaka) Village, Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
    © Van King
  		•  Thalénite-(Y)
    Y
     
    3
    		Si
     
    3
    		O
     
    10
    		(OH)
    Reference: [Am Min 69:196-199]
  		•  Thorogummite
    (Th,U)[(OH)
     
    4x
    		|(SiO
     
    4
    		)
     
    1-x
    		]
    Reference: []
  		•  Torbernite
    Cu(UO
     
    2
    		)
     
    2
    		(PO
     
    4
    		)
     
    2
    		·12H
     
    2
    		O
    Reference: []
  		•  Uraninite
    UO
     
    2
    Reference: []
  		•  Xenotime-(Y)
    YPO
     
    4
    Reference: []
  		•  Yttrialite-(Y)
    (Y,Th)
     
    2
    		[Si
     
    2
    		O
     
    7
    		]
    Reference: []
  		•  Yttrotantalite-(Y)
    (Y,Ca,U
    4+
     
    		,Fe
    2+
     
    		)
     
    2
    		(Ta,Nb)
     
    2
    		O
     
    8
    Reference: [Van King specimen]
    Site Photo
    Suishoyama pegmatite (Suishouyama; Suisyoyama; Suishyoyama), Iizaka (Iisaka) Village, Kawamata, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
    © Van King
  		•  Zeunerite
    Cu(UO
     
    2
    		)
     
    2
    		(AsO
     
    4
    		)
     
    2
    		·12H
     
    2
    		O
    Reference: []
  		•  Zircon
    Zr[SiO
     
    4
    		]
    Reference: []


    36 entries listed. 27 valid minerals. 3 type localities (valid minerals).

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