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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.




Group 2 - Sulphides and Sulfosalts
  		• Siegenite2.DA.05
    from CoNi
     
    2
    		S
     
    4
    		 to NiCo
     
    2
    		S
     
    4
    Group 4 - Oxides and Hydroxides
  		• Hausmannite4.BB.10
    MnMn
     
    2
    		O
     
    4
  		• Manganosite4.AB.25
    MnO
  		• Quartz4.DA.05
    SiO
     
    2
    Group 5 - Nitrates and Carbonates
  		• Rhodochrosite5.AB.05
    MnCO
     
    3
    Group 9 - Silicates
  		• Caryopilite9.ED.15
    (Mn,Mg)
     
    3
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
  		• Ganophyllite9.EG.30
    (K,Na,Ca)
     
    2
    		Mn
     
    8
    		(Si,Al)
     
    12
    		(O,OH)
     
    32
    		·8H
     
    2
    		O
  		• Halloysite9.ED.10
    Al
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
  		• Neotocite9.ED.20
    (Mn,Fe,Mg)SiO
     
    3
    		·H
     
    2
    		O
  		• Rhodonite9.DK.05
    MnSiO
     
    3
  		• Tephroite9.AC.05
    Mn
    2+
    2
    		[SiO
     
    4
    		]


    11 entries listed. 10 valid minerals.

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