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Ioi Mine, Shiga Prefecture, Kinki Region, Honshu Island, Japan

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Metamorphosed sedimentary manganese ores, parallel to bedding in Paleozoic meta-chert. A granitic batholith outcrops 3 km east of the mine, and may be related to the regional metamorphism.




Group 2 - Sulphides and Sulfosalts
  		• Alabandite2.CD.10
    Mn
    2+
     
    		S
  		• Arsenopyrite2.EB.20
    FeAsS - (Fe
     
    0.90
    		Co
     
    0.10
    		)AsS
  		• Marcasite2.EB.10a
    FeS
     
    2
  		• Pyrrhotite2.CC.10
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
    Group 4 - Oxides and Hydroxides
  		• Birnessite4.FL.45
    (Na,Ca)
     
    0.5
    		(Mn
    4+
     
    		,Mn
    3+
     
    		)
     
    2
    		O
     
    4
    		 · 1.5H
     
    2
    		O
  		• Galaxite4.BB.05
    (Mn,Fe,Mg)(Al,Fe)
     
    2
    		O
     
    4
  		• Hausmannite4.BB.10
    MnMn
     
    2
    		O
     
    4
  		• Jacobsite4.BB.05
    Mn
    2+
     
    		Fe
    3+
    2
    		O
     
    4
  		• Manganosite4.AB.25
    MnO
  		• Pyrochroite4.FE.05
    Mn(OH)
     
    2
  		• Quartz4.DA.05
    SiO
     
    2
      var: Chert4.DA.05
    SiO
     
    2
    Group 5 - Nitrates and Carbonates
  		• Rhodochrosite5.AB.05
    MnCO
     
    3
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• Baryte7.AD.35
    BaSO
     
    4
  		• Shigaite (TL)7.DD.35
    Al
     
    4
    		Mn
     
    7
    		(SO
     
    4
    		)
     
    2
    		(OH)
     
    22
    		·8H
     
    2
    		O
    Group 9 - Silicates
  		• 'Adularia'9.FA.30
    KAlSi
     
    3
    		O
     
    8
  		• Albite9.FA.35
    Na[AlSi
     
    3
    		O
     
    8
    		]
  		• Alleghanyite ?9.AF.45
    Mn
    2+
    5
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    2
    		]
  		• Bementite9.EE.05
    Mn
     
    5
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    6
  		• Neotocite9.ED.20
    (Mn,Fe,Mg)SiO
     
    3
    		·H
     
    2
    		O
  		• Rhodonite9.DK.05
    MnSiO
     
    3
  		• Sonolite9.AF.55
    Mn
    2+
    9
    		[(OH,F)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
  		• Spessartine9.AD.25
    Mn
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
  		• Tephroite9.AC.05
    Mn
    2+
    2
    		[SiO
     
    4
    		]
    Unclassified Minerals
  		• 'Amphibole Group'-
  		• 'Chlorite Group'-
  		• 'Garnet Group'-
    X
     
    3
    		Z
     
    2
    		(TO
     
    4
    		)
     
    3
    		 (X = Ca, Fe, etc·, Z = Al, Cr, etc·, T = Si, As, V)
  		• 'Mica Group'-


    28 entries listed. 23 valid minerals.

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