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Hamayokokawa mine (Hamayokogawa mine), Kami-Ina-gun, Nagano Prefecture, Chubu Region, Honshu Island, Japan

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Metamorphosed bedded manganese ore in Paleozoic sediments (metachert). Several orebodies, including the largest known of this type in Japan: 65x58x13m.
(1952 production 34,000 tons ore of 39% Mn, mostly from rhodochrosite.) Ref: Symposium sobre Yacimientos de Manganeso (Mexico, 1956); ed: Jenaro Gonzalez Reyna; v. IV: Asia y Oceania.





Mineral List:
  		•  Alabandite
    Mn
    2+
     
    		S
    Reference: [Fukuoka, M. (1981) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 24, #4, 207-252.; Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.]
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Lee, D. E. (1955)]
  		•  Alleghanyite
    Mn
    2+
    5
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    2
    		]
    Reference: [Fukuoka, M. (1981) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 24, #4, 207-252.; Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.]
  		•  'Amphibole Group'
    Reference: [Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.]
  		•  Baryte
    BaSO
     
    4
    Reference: [Lee, D. E. (1955)]
  		•  Braunite
    Mn
    2+
     
    		Mn
    3+
    6
    		[O
     
    8
    		|SiO
     
    4
    		]
    Reference: [Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.]
  		•  Diopside
    var: Schefferite ?
    (Ca,Mn)(Mg,Fe,Mn)Si
     
    2
    		O
     
    6
    Reference: [Lee, D. E. (1955)]
  		•  Hausmannite
    MnMn
     
    2
    		O
     
    4
    Reference: [Lee, D. E. (1955); Fukuoka, M. (1981) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 24, #4, 207-252.]
  		•  Hematite
    Fe
     
    2
    		O
     
    3
    Reference: [Dr. Kameki Kinoshita collection (curated at Geological Survey of Japan)]
  		•  Jacobsite
    Mn
    2+
     
    		Fe
    3+
    2
    		O
     
    4
    Reference: [Fukuoka, M. (1981) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 24, #4, 207-252.]
  		•  Manganosite
    MnO
    Reference: [Fukuoka, M. (1981) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 24, #4, 207-252.]
  		•  Neotocite
    (Mn,Fe,Mg)SiO
     
    3
    		·H
     
    2
    		O
    Reference: [Dr. Kameki Kinoshita collection (curated at Geological Survey of Japan); Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.]
  		•  'Psilomelane'
    Reference: [Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.]
  		•  Pyrolusite
    MnO
     
    2
    Reference: [Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.]
  		•  Pyrophanite
    Mn
    2+
     
    		TiO
     
    3
    Reference: [Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.]
  		•  Quartz
    SiO
     
    2
    Reference: [Lee, D. E. (1955)]
  		•  Quartz
    var: Chert
    Reference: [Fukuoka, M. (1981) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 24, #4, 207-252.; Dr. Kameki Kinoshita collection (curated at Geological Survey of Japan)]
  		•  Rhodochrosite
    MnCO
     
    3
    Reference: [Fukuoka, M. (1981) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 24, #4, 207-252.; Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.]
  		•  Rhodonite
    MnSiO
     
    3
    Reference: [Lee, D. E. (1955); Fukuoka, M. (1981) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 24, #4, 207-252.]
  		•  Spessartine
    Mn
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
    Reference: [Dr. Kameki Kinoshita collection (curated at Geological Survey of Japan)]
  		•  Tephroite
    Mn
    2+
    2
    		[SiO
     
    4
    		]
    Reference: [Dr. Matsuo Nambu ore collection (curated at Geological Survey of Japan); Fukuoka, M. (1981) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 24, #4, 207-252.; Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.]
  		•  Todorokite
    (Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)
     
    6
    		O
     
    12
    		·3H
     
    2
    		O
    Reference: [Dr. Matsuo Nambu collection (curated at Geological Survey of Japan)]


    22 entries listed. 18 valid minerals.

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