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Shiromaru mine (Hakumaru mine), Okutama, Nishi-Tama-gun, Tokyo Prefecture, Kanto Region, Honshu Island, Japan

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Low-grade manganese ore in metamorphosed sediments. Outcrops are now under the waters of Okutama reservoir. ("Hakumaru" is a misnomer for this locality.)





 Map Reference: 35°47'25"N , 139°2'42"E

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Group 1 - Elements
  		• Copper1.AA.05
    Cu
    Group 4 - Oxides and Hydroxides
  		• Cryptomelane4.DK.10
    K(Mn
    4+
     
    		,Mn
    2+
     
    		)
     
    8
    		O
     
    16
  		• Quartz
    var: Chert    		4.DA.05
    SiO
     
    2
    Group 5 - Nitrates and Carbonates
  		• Calcite5.AB.05
    CaCO
     
    3
  		• Rhodochrosite5.AB.05
    MnCO
     
    3
  		• Strontianite5.AB.15
    SrCO
     
    3
    Group 8 - Phosphates, Arsenates and Vanadates
  		• Gamagarite8.BG.05
    Ba
     
    2
    		(Fe
    3+
     
    		,Mn
    3+
     
    		)[OH|(VO
     
    4
    		)
     
    2
    		]
  		• Tokyoite (TL)8.BG.05
    Ba
     
    2
    		(Mn
    3+
     
    		,Fe
    3+
     
    		)[OH|(VO
     
    4
    		)
     
    2
    		]
    Group 9 - Silicates
  		• Aegirine9.DA.25
    NaFe
    3+
     
    		[Si
     
    2
    		O
     
    6
    		]
  		• Alleghanyite9.AF.45
    Mn
    2+
    5
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    2
    		]
  		• Andradite9.AD.25
    Ca
     
    3
    		Fe
    3+
    2
    		[SiO
     
    4
    		]
     
    3
  		• Banalsite9.FA.60
    BaNa
     
    2
    		[Al
     
    2
    		Si
     
    2
    		O
     
    8
    		]
     
    2
  		• Braunite9.AG.05
    Mn
    2+
     
    		Mn
    3+
    6
    		[O
     
    8
    		|SiO
     
    4
    		]
  		• Celsian9.FA.30
    Ba[Al
     
    2
    		Si
     
    2
    		O
     
    8
    		]
  		• Cymrite9.EG.05
    BaAl
     
    2
    		Si
     
    2
    		(O,OH)
     
    8
    		·H
     
    2
    		O
  		• Edingtonite9.GA.15
    Ba[Al
     
    2
    		Si
     
    3
    		O
     
    10
    		] · 4H
     
    2
    		O
  		• Eggletonite9.EG.30
    (Na,K,Ca)
     
    2
    		(Mn,Fe)
     
    8
    		(Si,Al)
     
    12
    		O
     
    29
    		(OH)
     
    7
    		·11H
     
    2
    		O
  		• Ganophyllite9.EG.30
    (K,Na,Ca)
     
    2
    		Mn
     
    8
    		(Si,Al)
     
    12
    		(O,OH)
     
    32
    		·8H
     
    2
    		O
  		• Grossular
    var: Manganoan Grossular    		9.AD.25
    Ca
     
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
  		• Harmotome9.GC.10
    (Ba
     
    0.5
    		,Ca
     
    0.5
    		,K,Na)
     
    5
    		[Al
     
    5
    		Si
     
    11
    		O
     
    32
    		] ·12H
     
    2
    		O
  		• Hyalophane9.FA.30
    (K,Ba)[Al(Si,Al)Si
     
    2
    		O
     
    8
    		]
  		• Marsturite9.DK.05
    NaCaMn
     
    3
    		Si
     
    5
    		O
     
    14
    		(OH)
  		• Orthoclase
    var: Barian Orthoclase    		9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Piemontite-(Sr)9.BG.05
    {CaSr}{Al
     
    2
    		Mn
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
  		• Rhodonite9.DK.05
    MnSiO
     
    3
  		• Tamaite (TL)9.EG.30
    (Ca,K,Ba,Na)
     
    3-4
    		Mn
     
    24
    		(Si,Al)
     
    40
    		(O,OH)
     
    112
    		·21H
     
    2
    		O
  		• Tephroite9.AC.05
    Mn
    2+
    2
    		[SiO
     
    4
    		]
  		• Tinzenite9.BD.20
    (Ca,Mn
    2+
     
    		,Fe
    2+
     
    		)
     
    3
    		Al
     
    2
    		[OH|BSi
     
    4
    		O
     
    15
    		]


    28 entries listed. 27 valid minerals.

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