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Okutama mine, Okutama, Nishi-Tama-gun, Tokyo Prefecture, Kanto Region, Honshu Island, Japan

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Weakly metamorphosed sedimentary manganese ore hosted in metachert. Mined during WW2, galleries now inaccessible. Principal ore mineral was caryopilite.





Mineral List:
  		•  Caryopilite
    (Mn,Mg)
     
    3
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]
  		•  Ganophyllite
    (K,Na,Ca)
     
    2
    		Mn
     
    8
    		(Si,Al)
     
    12
    		(O,OH)
     
    32
    		·8H
     
    2
    		O
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]
  		•  Halloysite
    Al
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]
  		•  Hausmannite
    MnMn
     
    2
    		O
     
    4
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]
  		•  Manganosite
    MnO
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]
  		•  Neotocite
    (Mn,Fe,Mg)SiO
     
    3
    		·H
     
    2
    		O
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]
  		•  Quartz
    SiO
     
    2
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]
  		•  Rhodochrosite
    MnCO
     
    3
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]
  		•  Rhodonite
    MnSiO
     
    3
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]
  		•  Siegenite
    from CoNi
     
    2
    		S
     
    4
    		 to NiCo
     
    2
    		S
     
    4
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]
  		•  Tephroite
    Mn
    2+
    2
    		[SiO
     
    4
    		]
    Reference: [Bull. Kanagawa pref. Mus. (Nat. Sci.), 22, 25-32 (1993)]


    11 entries listed. 10 valid minerals.

    The above list 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!
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