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Iou Island (Iwo Island; Iou-tou; Satsuma-Iou-jima; Satsuma-Iwojima), Kagoshima Prefecture, Nansei Archipelago, Japan

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Small volcanic island with very high temperature fumaroles (up to 880 degrees C). Rhyolite leached out by acid fumaroles was mined for silica (up to 97% SiO2). Fumarole gases here have the highest content of molybdenum vapour (1ppm) and gold vapour (32ppb) of any volcano (Hedenquist, et al., 1994).
(Note: This is NOT the same Iwo-jima that became famous in WW2 - See under Tokyo Prefecture.)





Mineral List:
  		•  'Albite-Anorthite Series'
    Reference: [Alfredo Petrov specimen]
  		•  Alunite
    KAl
     
    3
    		[(OH)
     
    3
    		|SO
     
    4
    		]
     
    2
    Reference: [S. Hamasaki (2002) Earth Planets Space 54, 217-229.]
  		•  Anglesite
    PbSO
     
    4
    Reference: [F. Africano, G. Van Rompaey, A. Bernard, F. Le Guern (2002) Deposition of trace elements from high temperature gases of Satsuma-Iwojima volcano. Earth Planets Space 54, 275-286.]
  		•  Anorthoclase
    (Na,K)[AlSi
     
    3
    		O
     
    8
    		]
    Reference: []
  		•  Augite
    (Ca,Na)(Mg,Fe
    2+
     
    		,Al,Fe
    3+
     
    		,Ti)[(Si,Al)
     
    2
    		O
     
    6
    		]
    Reference: []
  		•  Birnessite
    (Na,Ca)
     
    0.5
    		(Mn
    4+
     
    		,Mn
    3+
     
    		)
     
    2
    		O
     
    4
    		 · 1.5H
     
    2
    		O
    Reference: []
  		•  Buserite
    Na
     
    4
    		Mn
     
    14
    		O
     
    27
    		 ·21H
     
    2
    		O
    Reference: [Kazue, T. (2000) Clays and Clay Minerals, 48, 511-520]
  		•  Challacolloite
    KPb
     
    2
    		Cl
     
    5
    Reference: [Africano, F., Van Rompaey, G., Bernard, A., Le Guern, F. (2002): Deposition of trace elements from high-temperature gases of Satsuma-Iwojima volcano. Earth, Planets and Space, 54, 275-286.]
  		•  Cristobalite
    SiO
     
    2
    Reference: [S. Hamasaki (2002) Earth Planets Space 54, 217-229.]
  		•  Fayalite
    Fe
    2+
    2
    		[SiO
     
    4
    		]
    Reference: [Dr. Yasuko Okuyama-Kusunose analysis; Alfredo Petrov specimens.]
  		•  Ferrihydrite
    Fe
     
    5
    		O
     
    3
    		(OH)
     
    9
    Reference: [Kazue, T. (2000) Clays and Clay Minerals, 48, 511-520]
  		•  Goethite
    α-Fe
    3+
     
    		O(OH)
    Reference: [Kazue, T. (2000) Clays and Clay Minerals, 48, 511-520]
  		•  Hypersthene
    (Fe,Mg)SiO
     
    3
    Reference: [Alfredo Petrov specimen]
  		•  Ilsemannite
    Mo
     
    3
    		O
     
    8
    		·nH
     
    2
    		O
    Reference: [F. Africano, G. Van Rompaey, A. Bernard, F. Le Guern (2002) Deposition of trace elements from high temperature gases of Satsuma-Iwojima volcano. Earth Planets Space 54, 275-286.]
  		•  Kaolinite
    Al
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    Reference: [S. Hamasaki (2002) Earth Planets Space 54, 217-229.]
  		•  Molybdenite
    MoS
     
    2
    Reference: [F. Africano, G. Van Rompaey, A. Bernard, F. Le Guern (2002) Deposition of trace elements from high temperature gases of Satsuma-Iwojima volcano. Earth Planets Space 54, 275-286.]
  		•  Opal
    SiO
     
    2
    		·nH
     
    2
    		O
    Reference: [S. Hamasaki (2002) Earth Planets Space 54, 217-229.]
  		•  Quartz
    SiO
     
    2
    Reference: [S. Hamasaki (2002) Earth Planets Space 54, 217-229.]
  		•  Roedderite
    (Na,K)
     
    2
    		(Mg,Fe)
     
    5
    		Si
     
    12
    		O
     
    30
    Reference: [www5b.biglobe.ne.jp/~mineral/roedderite2.htm. ; Forrest Cureton specimens.]
  		•  Sassolite
    H
     
    3
    		BO
     
    3
    Reference: [fumarolic]
  		•  'Siderogel'
    ~FeO(OH)·nH
     
    2
    		O
    Reference: [Kazue, T. (2000) Clays and Clay Minerals, 48, 511-520]
  		•  Sulphur
    S
     
    8
    Reference: [fumarolic; Alfredo Petrov specimen]
  		•  Tridymite
    SiO
     
    2
    Reference: [S. Hamasaki (2002) Earth Planets Space 54, 217-229.]
  		•  Wulfenite
    Pb[MoO
     
    4
    		]
    Reference: [F. Africano, G. Van Rompaey, A. Bernard, F. Le Guern (2002) Deposition of trace elements from high temperature gases of Satsuma-Iwojima volcano. Earth Planets Space 54, 275-286.]


    24 entries listed. 19 valid minerals.

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